Cisco Switching/Routing :: 3750 - MSTP Design And Network Diameter Limitation

Jan 25, 2011

I am just browsing and looking for a solution to converge my multi-vendor switched network and bring some redundancy to it as recently
we managed to get a redundant links. I have a need to change core switch to Cat3750G, which has Per-V LAN-RSTP+ on board, but tests have shown that it won't be compatible with some other proprietary per-V LAN RSTP solution other vendor's switches use currently.
So, I thought maybe standard-based MSTP design might do the trick. I've made some tests and got some weird and unstable switching result. I have two topology rings with a core switch in the center. Every ring has about 10 switches, so practically network diameter may vary from 5 switches (when spanning-tree converges in the center and I have a blocking port somewhere int the middle of the ring) to about 10-11 switches (if a I have link failure on any of ports right at the core switch). I disconnected one port from core switch to eliminate a possible switching loop while I will be configuring new MSTP design. Then I started enabling MSTP on all the switches staring from core Cat3750G to MSTP, one by one, placing all switches to the same MSTP region, and placing all V LAN's to default MSTI0(CIST) cause I don't need to organize any separate MSTP instances for every V LAN or for group of V LAN s. When I turned MSTP on on 7th or 8th switch in the chain (cause I had a physical chain when I disconnected one port out of redundant ring) I got all switches "flapping", storming and flooding the network with broadcasts. Even when I had one redundant port disabled.
I have no idea what I am doing wrong. I noticed that Cat3750G has an option that defines a possible network diameter which actually automatically changes some hello, max age etc. attributes according to diameter specified. When I defined a maximum network diameter of 7, if didn't change anything: I still have hello timer of 2 sec etc. I've been wondering if the maximum network diameter has something more than just a "variable" to fine tune hello timers etc? Maybe I won't be able to use MSTP in my network which might have diameter more that 7 switches. Or maybe it was a mistake of placing all the switches to the same region and all the v LAN s to the default MSTI0 (CIST) and I should configure one MSTI per V LAN or per some group of V LANs and subdivide my switches to few MSTP regions?

My topology briefly looks like this:

|                                            |           |                                         |
+---SWxx---SWxx-----------+           +------SWxx-----SWxx----+
As I said, each "ring" has about 10 switches connected side by side.

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Cisco Switching/Routing :: DHCP Limitation On 3750 Switches?

Jul 16, 2012

I want to clear following things regarding Cisco 3750 switch.

1. Can I configure Multiple DHCP pool on C3750?

2. Performance effect due to same?

3. Can I resrve IP addrese from DHCP pool for specific MAC address.

4. Can I Exempt IP address from DHCP pool ?

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Cisco Switching/Routing :: 3750 To Connect Routed Interfaces And Vrf Design

Sep 26, 2012

I would like to do the following architecture with the same C3750 : network X,Y,Z connected to 3750 in VRF D the 3750 uses a routed interface on subnet E for the default route in VRF D on this routed interface a BYPASS EQUIPMENT the other BYPASS EQUIPMENT interface is connected also to another routed interface on subnet E "also" this routed interface is in another VRF C with other network A and you know if it will work because of 2 routed interfaces on the same IP subnet or is there a way to do that ? the only goal for me is to catch traffic from network X,Y,Z on SYN and ACK.

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Cisco Switching/Routing :: 3750 - LAN Switching Design

Nov 17, 2011

I have a typical LAN environment that spans across a large warehouse. I have done a lot of redesigning of the environment to satisfy the need for a disaster recover plan. I now have created a LAN with multiple v lans and must also connect all the access layer switches back to the core switch where the servers are.
I was thinking of something simple such as Port channel of 2 Gbps across the backbone and simple floating static routes . I have then moved my wan access link to a 3750 and implemented routing a CEF at each of the 3 core switches (blue). My question is more of design.

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Cisco Switching/Routing :: 3560G / 4948 / 3750 / 3600 - DC Core Design

Jun 19, 2012

I'm working designing a switch system for our core/data center.
We have 5 esx hosts, 2 sans with 3 nodes each.  We have voice servers, a couple of routers and a few odds and ends.  There are 7 other locations aggregating into this data center via 1-2gbps fiber connections.  The bandwidth usage on these links is minimal, but there is a total of about 3000 devices aggregating into the system. My main concern right now is the 3560G's are seeing many output drops, due to the small buffer size on those switches.  I have been looking at couple of options to resolve this issue, including the 4948E, 4507E, and 3750X switches.
Budget being the biggest factor, I am finding that the 4507 might be out of the price range.  So I was leaning towards the 4948E switches for connecting the servers and iscsi san's as the 3750X is not recommended for iscsi.  Redundancy is important so I would like to have two. The second concern is that I need to aggregate the fiber connections and for that I was looking at the ME-3600X or possibly the WS-C3750X-12S-E.  I'm running eigrp, so this switch would need to have full routing, as it would also serve as the core switch for the 4948E's.
So in the end I was thinking that two 4948E switches up linked to the ME-3600X which would do full routing for the fiber aggregation and any routing needed for the servers and sans.
Servers and Sans_________4948E________ME-3600X_________7 fiber connections
I would look at a second ME-3600X in the future for redundancy.  This is the lowest cost biggest buffer solution that I could find.

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Cisco Switching/Routing :: 802.1w / 802.1s - Diameter Versus Max Hops

Jan 25, 2013

What is the difference between the Diameter and the Max Hops Remaining in RSTP/MSTP? Like Cisco, the maximun value for diameter is 7, but, can i have a ring topology with 10 switches in the Network?

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Cisco Switching/Routing :: 7609 Routing Interface Attend MSTP Calculation

Mar 7, 2012

On a pair of my CISCO7609-s (engine:sup720-3B IOS Version:12.2(33)SRD4),some interfaces is configured as routing interface but also them are attend MSTP caculation and i really caught BPDU packet go out from these ports. [code]

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Cisco Switching/Routing :: 3750G MSTP Traffic Interruptions

Feb 15, 2013

we have 3750G stack connecting to H3C switch cluster connecting through two trunk portchannels.and we have MSTP configured since H3C support only MST.MST is configured as below.instance 1 1,168,178,198instance 2 148,158,188,instance 1 LANS are extended to H3C,instance 2 VLANS are local to 3750 stack.,As a new requirement we need to add a another VLAN to this topology.and we are planing to add this VALN to instance 1,can there be any traffic interruptions.

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Cisco Switching/Routing :: 7450 / ASR901 Only Support MSTP In The EVC Configuration?

Jun 20, 2012

I have RSTP rings consisting of Alcatel 7450's and Foundry FES switches.  I want to insert Cisco ASR901's into these rings and have been testing in the lab.  It appears that the ASR901's only support MSTP in the EVC configuration.  So I would prefer to keep RSTP on the Alcatel and Foundry's and enable MSTP on only the ASR901's. 
Topology is:7450-2 <=> Foundry-2 <=> ASR901-2 <=> Foundry-1 <=> ASR901-1<=> 7450-1 with a VPLS between the 7450's.
If I enable MSTP in the Foundry's, Alcatel and ASR901 everything works fine.  If I keep RSTP on the Foundries and 7450's, then STP also works, with the exception of a Foundry-2 switch running RSTP, that is located between 2 ASR901's running MSTP.  This switch does not seem to interact with the other switches (i.e. thinks it is the root bridge).Since there are mulitple MSTP boundary's, do the ASR901's need to be in different IST's/instances?

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Cisco Switching/Routing :: SG300 Feedback On New Network Design

Jun 1, 2012

I'm looking for feedback and constructive criticism on our network redesign project for our company.We are currently on a 192.168.1.x/24 and running out of addresses. We are looking to move to the following design and implement VLANs as well for segregation and security. We are probably going to use a few SG300s for switches. [code]

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Cisco Switching/Routing :: 2960 G / 1941 - Network Design

Jun 14, 2012

I have been recently asked to design a network. What I have for equipment is four 2960G's and one 1941 router. One switch is a root switch and the other three will have end devices on them.I have decided on three V lans to go with: VLAN20 Data, VLAN30 ISCSI, and VLAN99 Management each with seperate trunk links and redundancy (see picture below).

I have a seperate trunks for each V lan using the switch port trunk allowed. With exception to the Data V lan.My design has the Data V lan as the native because it is going to be receiving untagged traffic from the external network. I have set up inter v lan routing on the 1941 via sub-interfaces to allow them to talk to each other (or because of allowed they cannot?). I have one port coming from my router to my switch via Ethernet cable which is my bridge out. I have my external port doing a NAT translation for my inside addresses and a Default route set up ip route gig0/0. I am using rapid- PVST to prevent loops and provide my zero downtime convergence when a link goes down. As it stands right now I cannot talk out of my network or inside of my network. 

You can see it is highly redundant and I do not want to change it. This network is going to be deployed but there will never be anybody physically there to manage it which is why I made it as redundant as humanly possible.

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Cisco Switching/Routing :: ASA5505 / Network Design With Multiple Gateways?

Apr 11, 2013

remote location on MPLS circuit terminated on a Cisco router that has Internet connectivity through Central Site router.  We are installing a cable modem at the remote location that is to be used  as the Primary Internet Connection but still be able to use Internet through MPLS if the cable Internet goes down.  We want the failover/fallback to be handled automatically.
We have an ASA5505 for the cable Internet which then feeds into the ISPs modem. 
At first I was thinking about getting a module for the remote router so the cable Internet could be terminated on the remote router as well but that introduces a single point of failure.  I would also like to firewall both the MPLS and the cable Internet but if I do so on the ASA there is another single point of failure.

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Cisco Switching :: 3750 - IP / VLAN Planning For Routed Access Design?

Sep 10, 2012

We are currently designing a complete Layer 3 to the edge solution for our customers. The network design is a combination of a collapsed core (Core to access) as well as a three layer model (Core/Distro/Access) for connectivity to the Data Centre, Internet and Wireless Blocks.
The core of the network contains two 6509E switches interconnected on a Layer 3 Port channel (no VSS). Access Layer switches (3750 Stacks) connect to the core switches over p2p routed links (Collapsed core part of the design). Distribution layer switches provide connectivity to the Data centre, Internet and Wireless Blocks.(three layer model.
All IP addressing is being planned for assignment from the private RFC 1918 address block( for both Infrastructure and Access layer VLANs for users.
Clarifications required for the following:


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Cisco Switching/Routing :: 10 Gig Distance Limitation Between 6704's

Jan 26, 2012

Looking to link up to 6513 chassis via 6704 10 gig cards.
I have a 6513 on the 8th floor and one on the 3rd floor in same building. Distance would be approx 150' max. New 10 gig cabling was installed between these floors.
I would like to use 2 10 gig ints on each 6704 to form a port channel (LACP) between the 2 environments.
So far I have been unable to get the links up between 6704's.

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Cisco Switching/Routing :: Nexus 7000 Span Limitation

Apr 18, 2012

I've learned recently that the Nexus 7000 only allows the configuration of a maximum of 2 Monitor sessions for spanning traffic. I only have one monitor session left and I need to do the following. 2 Core Nexus 7000 boxes with 2 different traffic probes/sniffers to each nexus( eg Sniffer 1 connects to Switch A on interface eth 1 and to Switch B on eth 1 ; Sniffer 2 connects to Switch A on eth 2 and to Switch B on eth 2.) My plan was to setup a standard session with multiple sources and destinations then on the interfaces connecting to the sniffers run a trunk and do 'sw trunk allowed xxxxx' and filter what I need to go to each sniffer box. However I've recently found out that some of my source traffic is coming from Port-Channel interfaces. Is there a way I can get around this and still do the filtering within only 1 monitor session ?

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Cisco Switching/Routing :: 1921 Router - Bandwidth Limitation

Oct 20, 2011

I have the following setup:
Cisco 1921 is my core router and connected to it is a 30 Mbit fiberline
Now, the thing is that i want VLAN2 to have a 5 Mbit bandwidth limit to Internet but full speed to VLAN1.
I have played around with Rate limit without success.
I also have access to cisco switches that can limit the bandwidth.

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Cisco Switching/Routing :: 3750X Stack Power Limitation With Non-POE Switch?

Oct 28, 2012

We have 9 x 3750x switches with 5-nonPOE and 5-POE. There is a limitation with 4 POE per stack with Stack Power.
Can we combine all 9 to one stack since there are only 4 POE?
Or, is the 4-switch limitation applied regardless if they are mixed with POE and non-POE?

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Cisco Switching/Routing :: User Based Bandwidth Limitation On 2950 Switch?

Feb 12, 2012

I have a cisco 2950 switch, connected with 4Mbps of internet and number of users will access the internet. There is no restraction on bandwidth limit for users, if any body use high download the remaining users are facing the slow browsing problems.
So, if i can put a bandwidth limitation for every users the problem will be solved. how to restract the bandwidth on user bases.

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Cisco Switching/Routing :: Inbound And Outbound Per Port Bandwidth Limitation 3560

Feb 21, 2013

I'm intending to purchase a switch for work,and I need to limit the bandwidth of one of the ports to 25 Mbit upload and 25 Mbit download (we have 100/100 Mbit connection and the customer is only paying for 25). I been trying to find information on how this could be "properly" done and what kind of switch I need to buy. As far as I have understood, most L2+ switches support outbound rate limiting, but not inbound, and as I only want the customer to have 25 mbit up and down, I need both.
I been looking at a Cisco Catalyst 3560 switch, and I'm first and foremost wondering if I can limit the inbound AND outbound bandwidth on this switch? Perhaps it can even be done on a simpler, cheaper, switch - as I rather not spend more money then necessary?
Lastly, how to do it, limit the inbound and outbound bandwidth on a single port (perhaps on the above mentioned switch, if possible), to 25 Mbit?

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Cisco Switching/Routing :: 4506 Resilient Routing Design With OSPF

Aug 27, 2012

We have 2 sites, each with 2 x 4506 switches which will be connected togther using an etherchannel. The switches will provide access ports for client devices and will be configured with HSRP to provide gateway redundancy. SW1 will be HSRP active.2 metro ethernet links will be installed in each site which will connect back to our HQ sites. OSPF will be used over the backbone to provide resiliency and to allow shortest path routing to each HQ and to prevent traffic over the HQ to HQ link.

The 4506 will be trunked togther with an SVI for providing OSFP adjacency.For the traffic flow from SW2 to HQ2, traffic will hit SW1 and then route back to SW2 and then to HQ2. Is this the best way to do this? Should a second link be connected between switches just for routing or should something like GLBP be used?

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Cisco Switching/Routing :: 2921 - VTP Design

Jun 22, 2012

We have remote office where we have 2921 router with 6 layer 2 switches. We have few servers which need to be in specific vlan.
2921 router does not have switching engine we are using this to support VOIP.

So on 2921 router i created 6 sub interfaces for each vlan and assign them to their specfic vlans. Then I have trunk connection to switch 1. Now switch 1 connects to all other switches in the network. As our company design all layer 2 switches should be transparent mode. i tested them i can ping from one switch to all other switches.

Router vtp mode i set to transparent mode and from all switches i can ping the router sub interfaces.

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Cisco Switching/Routing :: 6500 - HSRP Design And VSS

Apr 17, 2012

is it possible to run hsrp on two routers (not l3 switch) connected to a l2 switch ? if so does the two routers need a back to back connection ?
i know if use two l3 switches (instead of routers) and connect to a LAN switch then we need a back to back connection between the L3 switches
also can we use hsrp on vss on 6500?
1800 router                                       1800 ROuter
     |                                                        |
     |                                                        |
     |---------- L2 switch-------------------------------|
if the above design is acceptable how does the routers know which one is active and which one is standby ? if we need a direct connection between two routers they have to be on a seperate subnet and routers dont allow broadcasts - so how will hsrp work on routers ?
L3 switch --------------------------l3 switch
   |                                            |
   |                                            |
   |---------------L2 switch---------------|

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Cisco Switching/Routing :: 2960S / LAN Design Using 10G EtherChannels?

May 11, 2011

We are designing a LAN Network for ourselves.The proposed design is as follows:
4 x 2960S switches in a Stack   Access-Stack-I 4 x 2960S-PoE switches in a second Stack Access-Stack-II
2 x 3750X switches in a Stack   Core-Stack
Now I would like to connect it in the following manner ?First,I would like to use EtherChannel using the 10Gig LinksSecondly, I would like to use Cross-Stack EtherChanel too.I have given a graphical illustration of the connectivity Now my Qs: a) Will the 2960S supports EtherChannel using the 10G links and the 3750X too... b) Does the proposed solution will work... or It will have any problems.

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Cisco Switching/Routing :: 4507 - New Media Net QoS Design

Aug 25, 2012

QoS design problem that I have. I have a client that is deploying new 4507 series switches with SUP6Es. The client will be running lots of voice, streaming video, and video conferencing over the LAN and want to base QoS on Cisco Media net recommendations.
I need to design a new QoS policy with focus on the above media services with basic queuing for critical data services. I have read the Media net design guide and the suggested 12-class model will be too complex to start with but I have seen references to start with a 8-class model with the ability to easily migrate to 12-class in the future. The 8-class model meets all of our requirements but I need to understand how this will work with the 4507 queuing model? [URL]

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Cisco Switching/Routing :: LAN Segmentation Design 6509

Apr 25, 2012

I've been tasked to come up with a design to segment our internal network to reduce broadcast domain size.  In addition, we are running out of DHCP available DHCP addresses.  I need to have a solution that will give me more available IP's, but reduce our broadcast domain.
We are Cisco VoIP shop.  Our current environment consists of dual 6509 chassis in a VSS config.  We have 10 access switches that are model 3750's.  Each 3750 has dual 1Gb fiber links to the VSS Core in an etherchannel configuration.  We have 2 VLANS (data and voice) that spread throughout every switch.  Both VLAN's have their own DHCP scope.
Our current broadcast domain is a, so we have over 2000 potential broadcast devices.  Cisco recommends not having larger than 512.  So my research has brought me to a design as follows:
          MY DESIGN:
>  Have individual voice and data VLANs for each closet switch. 
>  We have 10 closet switches so this would require 20 new vlans
>  With every separate VLAN we would need a different DHCP scope. 
>  Configure 20 new DHCP scopes for the 20 new VLANs. 
>  Each DHCP scope would have a 512 available addresses.
>  Enable IP Routing and configure EIGRP on the VSS Core and 3750's.
>  I'm tossing around the idea of have each 3750 be an EIGRP Stub.  Not sure yet.
1.  How to verify what I described in my design? 
2.  Any alternative solution that might be less complicated than configuring Layer 3 on all my access switches? 
3.  Any thoughts on configuring EIGRP Stub vs. having the VSS Core do all the work?
4:  Any template that I could base my 3750 config from?

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Cisco WAN :: 3750 / BGP Multihoming Design Topology

Apr 17, 2012

Currently we have a 50mb pipe with our carrier SONIC. We have signed another contract with another provider here in town (Charter) to multihome our Internet connections in an active/active configuration. We have leased our /24 space through our carrier SONIC. ARIN has already approved our org-ID for an ASN and they will be sending us that once the billing portion is finished.
There a few design considerations I was hoping I could get some insight from the community on.. Before I start, the ultimate goal for us to use BOTH Internet connections in an active/active configuration - utilizing both pipes..
Disclaimer: I have gathered this design from a lot of other posts that have somewhat of a similiar topology with ASA-->3750-->router pair-->CPE--internet...
What kind of routes should I get from each carrier? I have been told that partial/partial routes plus a default route form each carrier is the way to go. Also, I've heard mention that full routes from both carriers are preferred. My ASR1001's can support ~500k routes. I know the global table is approximately ~337k routes. My goal is to use both pipes and use the best outbound path per carrier. 

We will be leasing our /24 space from SONIC. I plan on running OSPF on the DC-Edge-SW1 in conjunction with iBGP - so I can default originate two equal cost routes back to my ASA. My confusion is when the traffic hits DC-Edge-SW1, there will be default equal-cost iBGP routes to both ASR1001's (DC-Edge-RT1 & DC-Edge-RT2). If the switch does not have the BGP table, it will just load-share across both ASR's. When the traffic hits the ASR's, will they know which carrier has the best path and route accordingly? 

Should the iBGP connection between both routers be directly connected ? Or will it suffice through the L3 3750 connection? Also, with the limitations on the routes for the ASR1001 at ~500k. If we end up getting full routes from carriers and create a iBGP neighborship between both routers, will this exceed the route limitations on this platform? On both routes, I will have the network statement 'network mask' This is a leased network from SONIC, and we NAT everything on our ASA to My question is, will this be a problem broadcasting this network from our AS to both carriers AS? Refer to bgp-design.jpg - is it a requirement that I use our leased public subnet for the interfaces from ASA5510 -> 3750 -> ASR1001? 

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Cisco Switching/Routing :: M1000E - Small Datacenter Design

Apr 19, 2012

Small datacenter design.  My requirements and setup will be as follows Dell PowerEdge M1000E Blade Chassis (initially one full chassis)Dell Powerconnect 10GbE Blade SwitchesDell Compellent Storage Array 10Gb iSCSI with redundant controllersDell Powerconnect 7024 dedicated external storage Virtual host blade servers 2 x Cisco ASA for firewall (5525-X or similar in active-active configuration)2 x redundant routers or switches as gateway to public internet I am looking to be able to segregate customers (approximately 100) into seperate VLANs at the access layer and route them up to the Cisco ASA firewalls using Dot1Q trunking for segregation.  The Cisco ASA's will perform NAT functionality and route to the redundant gateways.  I then need to police each customers traffic at the gateway to limit bandwidth and perform specific traffic marking along with simply routing out to the internet.

 Budget is somewhat restrictive so I am looking for the most "cost effective" devices I can use at the gateway to perform the traffic policing/marking/routing for each customer. 

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Cisco Switching/Routing :: 2960S / 6509 VSS - QoS Design Options?

Sep 26, 2012

On occasion employees are downloading large files for business purposes, at very fast speeds. This has the potential to overwhelming our Internet circuits which causes our Customers problems accessing our Web Hosting services.
Our network is comprised mostly of 2960S switches for the employees. Webservers are connected to other 2960(nonS) switches and directly into the 6509 VSS.
Customer’s traffic comes in through one pair of ASA’s.
Employee’s traffic is handled by another pair of ASA’s.
Employee traffic flows from the 2960’s, past an L3 SVI on the 6509, then through the Employee ASA’s, then to the ASR’s, then out to the ISP#1 or ISP#2
Web Server traffic flows from the 2960’s or 6509, to the Customer ASA, then to the ASR’s then out to ISP#1 or ISP#2. Web server traffic does not flow through an L3 SVI.
The goal is to allow employees the ability to have the most bandwidth they can, however customer traffic always has to be preferred in the event of a ISP circuit approaching its limit.

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Cisco Switching/Routing :: Nexus 5548UP To 2248 Design

Aug 10, 2012

This past networkers I was at the Cisco booth discussing how the 2248 can connect to the 5548 and have server connectivity.  It was told to me that now, as of a fairly recent NX-OS release, you can have the 2248 going dual-homed to both 5548 via VPC and then have a server connected to both 2248 and be in active-active mode.  Is this correct?
When we first deployed our 5548 and 2248 we had to put the 2248 in a straight pin mode, where it only had connections to one 5548 and then the server would dual connect to the 2248's and be in active-active mode.  I was told that this changed with an NX-OS release however documentation still seems to be fragmented on what exactly is the case. 

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Cisco Switching/Routing :: Co Location Rack Network With 3750

Mar 25, 2013

I  am considering running stacked 3750 L3 switches as  the edge of the  network, which will connect to the ISP. The ISP would  hand off two  lines with one to each switch and two lines to each client  zone. Does running HSRP, running  port channels, or running routing protocols seem like the  best option  for redundancy?
Lastly,  will the 3750 provide all the QoS I should  need for restricting each  client zone's bandwidth both up and down?  Could I get away with a lower  model and still get these features?

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Cisco Switching/Routing :: 3560 - OSPF Load Sharing Design

Sep 16, 2012

We have our network setup as displayed in the attached. We have 2 HQ offices and 1 branch office. The branch office needs to connect to resources located at both HQs but taking the most effecient path. We have ethernet circuits connecting from each HQ to 2 x Cisco 3560 switches in the branch. HSRP has been configured on the 3560 switches with SW1 as active and SW2 as standby. OSFP has been configured in a single area 0 and the path cost on the link between HQs has been increase to allow 3560 SW1 to route to HQ1 directly and HQ2 via 3560 SW2.The 3560s are connected with a trunk with a L3 SVI for OSPF. This seems to work ok but I have noticed that the branch could become transit if the HQ1 to HQ2 link breaks. How can this be avoided? I realise that if we configure the branch subnets and SW1 to SW2 link in a stub area (area1) then all traffic will route from SW1 to HQ1 and will never share over SW2. I'm assuming that this is because OSPF chooses inter-area routes over intra-area.

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Cisco Switching/Routing :: 3750 Switches Doesn't See Traffic From Other Network

May 21, 2012

we have three separated network segments going to one Cisco 3750 switch all is L2 .. from this switch is 100 mbit uplink.we need to apply some Qos mechanism not to saturate line by traffic from one network.. Configuration from various reason CANNOT be done on switch where 100Mbit line is terminated.. so all must be done on SW1,2,3..Correct me if iam wrond but as switches doesnt see traffic from other network iam affraid only think we can do  is limit bandwidth on links going into SW1,2,3 to 33 Mbit.I found commad srr-queue bandwidth limit.But links going to SWs are 1Gbit so if i force bandwidth to 10% (minimum what command allows) its  100 Mbit..If I force speed on those links to 100Mbit and than apply  srr-queue bandwidth limit to 30% doest it work.??. Will  srr-queue bandwidth limit speed to 30Mbit?? Or srr-queue bandwidth limit is calculated from maxim speed of interface?

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Cisco Switching/Routing :: 3750 / 3500 - Separate Network Into 2 VLANs

Feb 13, 2012

Currently we have an Ava ya IP Office switch running on the same network as our PC clients. I would like to seperate the two network into 2 V LAN's.

We have a mixture of Catalyst 3750 switches and some older 3500 models.Where do I start? Should I leave the PC's and servers on the default V LAN and just move the IP handsets?

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