Cisco Switching/Routing :: 6513 To 3750 Vlan Trunk Connectivity
Nov 8, 2011
Currently we have a 6513 core (running IOS and doing limited routing) with VLAN Trunking to about a dozen 3560 edge switches, with various VLANs going to each of the edge switches. All works well. We are downsizing and replacing the 6513 core with a 3750G stack. We have the stack up and running in the lab, and want to slowly (as we move floors) migrate all of the edge switching to the 3750 stack.
The plan is to connect the 3750 stack to the 6513, then slowly migrate the edge switches to the stack (from the 6513). I would like to put in place 4 x 1GB trunk links between the 6513 and the 3750 stack before I start moving edge switches to ensure adequate bandwidth. Once all of the edge switches are on the new 3750 stack, I will start to decommission the 6513.
What is the best way to configure the links between the cores (old 6513 and new 3750 stack)? I can easily get the edge switches configured to the 3750, but am worried about the core links. I really want to avoid having to perform an all-at-once cutover of the cores. Another question is when do I try and migrate the VTP server role from the 6513 to the 3750 stack? I could simply make everything transparent, and ditch server-based VTP, as we rarely change or creat VLANs.
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Nov 13, 2012
I have a 3750 as a core and have a series of HP Procurve switches that are daisy chained using one port. I have two vlans on the port now (6 &9) and everything works fine, all switches communicate and end devices on the switches are also talking. There is a requirement to add a device towards the end of the chain which requires it to connect using Vlan1. Once I add Vlan1 to the port onthe 3750 I lose connectivity to all the HP switches.
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Jan 16, 2013
This is regarding VLAN creation on C3750E switch.I want to create new Vlan 94 on this switch and also I want to allowed same interfaces like Vlan 95 & Vlan 96. [code]
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Sep 26, 2012
Cisco 4506-E port configuration
WESTERN-4506-01#show int g4/47
GigabitEthernet4/47 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet Port, address is 0022.554c.01fe (
fe)
Description: Trunk to 425
[code]....
Cisco 3750 Configuration
interface FastEthernet1/0/1description 425Linkswitchport trunk encapsulation dot1qswitchport trunk native vlan 30switchport trunk allowed vlan 30,35switchport mode trunkswitchport nonegotiateswitchport port-security aging time 2switchport port-security violation restrictswitchport port-security aging type inactivitystorm-control broadcast level pps 300storm-control multicast level pps 300storm-control action trapmacro description cisco-desktopmac access-group AuthorizedHosts in
I have mac address' populated. I can see the device in layout on CNA with the proper name however cannot ping it.
4506 is 10.30.30.1
3750 is 10.30.30.2
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Nov 8, 2011
I have a couple 3750 switches that I am trying to run VTP Version 3 on.one as primary and the other as "server" which implies secondary from my research. [code]Additionally, running a show VTP devices yields a "No VTP3 devices found" on both devices. Despite ensuring that the domainname and password match.I have a patch cable from Gi1/0/1 on switch one runnning to Gi1/0/1 which from what I read is acceptable on GigE.
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Jan 29, 2012
I have client who has two distant offices with 3750 L3 as core (do all vlan routing for local office) and multiple L2 access switches with multiple VLAN’s connected to it. First 3750 is hub also connected to internet, second 3750 is spoke and acting as a router on stick. We have eigrp configured on both side ISP provided client 100Mbps link as a trunk with two vlan; vlan10 for voice and vlan20 for data. We assigned two small subnets to these vlans 10.15.17.0/29 and 10.15.17.9/29. Hub addresses are 10.15.17.1 and 10.15.17.9 respectively. How to force voice over VLAN10 and data via vlan20, but still do some load balancing? How to setup default route on second (router on stick) switch?
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Feb 11, 2013
I have 2 hosts, 1 plugged in fa 0/21 in VLAN 101 and another in fa 0/22 in VLAN 101 on our L2 Cisco 2960. If I try and transfer files from either host the gig 0/1 trunk port on the 2960 leading tot he 3750 fa 0/1 port hits 100mb (using a real time bandwidth monitor tool), but why? This VLAN is on the same switch, why does it go one way up the trunk to the L3 3750 switch? The L3 3750 is the VTP server and the 2960 is a client. I would of thought the traffic stays local. The 2 hosts don't even have a gateway set.To sum up the typology the 2960 and 3750 are trunked using a single cable. The 3750 hangs of a ASA firewall using SVIs.Here is whatthe traffic looks like when copying a file between hosts (2gb file).
3750 L3 Switch (VTP Server)
interface FastEthernet1/0/4
description Trunk to Cisco 2960 Gig 0/1
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
[code]....
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Sep 22, 2012
I need to set QOS in our new network. We have connected 2 cities together with 700Mbit leased line. On each side we have Catalyst 2960S switches and between them is TRUNK for VLAN 10 and Vlan 20.Vlan 10 is for IPTV (fixed 400 Mb/s for CATV)Vlan 20 is for Internet (rest).Sometimes is happening that Vlan 20 takes more than 400 Mb/s for a few seconds and in this situation we have problems with CATV.Is there any way to make a guaranteed bandwidth 410 Mb/s for CAT - VLAN 10 on this swithces?
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Jan 27, 2013
We bough an Cisco 2911 router, and as i see the "ip sla monitor" command is not supported. Which license/IOS upgrade should i buy the fullfill this. And i cant add a trunkport to the iunterface even cant add a vlan to interface. How do i a trunkport on the cisco 2911 router. ANd how can i do a vlan on a interface on the router.
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Oct 3, 2012
Is it possible to rate limit on a L2 trunk port on a 3750?
current port config and ios are as follows;
interface GigabitEthernet1/0/50
description *** Connection to Fiber Link ***
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,172
switchport mode trunk
end
flash:c3750-advipservicesk9-mz.122-46.SE.bin
i was wondering if the "srr-queue bandwidth limit 10" command would work to limit the output from this interface to be 10 % of the port bandwidth and then the same command could be done on the other side.
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Mar 18, 2013
I am taking only undersize errors on catalyst 3750 trunk interface (attached some outputs)...the other end is a 4500 switch and the interface is clean..can this be related to any bug ? this is my root port and often leading to trouble sometimes STP BPDUs transportation are affected..
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Dec 6, 2012
can i have 4 links from an ESX server to 6500 , each link represents a trunk link carries each the same 2 VLAN , 100 and 101 , keep port-channel out of the picture , does it work well?
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Jul 5, 2012
I have a 2960 switch connected to another. The I need to verify that vlan0010 on one switch is forwarding tagged traffic between the other switch it is hooked up to through the Gi0/1 port. How do I verify this? I have a server that's multihomed (Broadcom) on the other side an it is supposed to be on this vlan with one of it's network interfaces. We had a pwer outage and now it cannot communicate on this vlan. However, everything else on the vlan can reach all the other nodes accept this server in the front of my building. All the devices in the same room are linked to the same switch which has one port (fa0/17) on vlan0010 and can ping eachother just fine. The server is hooked to port 24 on my server room switch and Gigabit port one goes to a fiber converter all the way to the back. It then gets converted from fiber to cat5e again and links into the switch (2960) in the backroom.
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Jan 25, 2012
Need to limit the amount of bandwidth a specific VLAN can use on a 802.1q trunk port. Situation is that we have a pair of Catalyst 4506 switches which have 802.1q trunk ports into a Checkpoint Firewall, this in turn is connected to a managed WAN router (to which I can't apply a QoS policy).If the 4506 was routing the traffic it would be easy to setup a class-map to match the IP traffic and then QoS the traffic, but the VLAN in question is trunked directly into the firewall (no L3/IP presence on the 4506 next hop for all clients on this VLAN is the firewall).What I need to do is restrict any traffic from this specific VLAN to 10Mbps on the uplink to the Checkpoint Firewall so it cannot impact the onward WAN.
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Nov 15, 2011
a number of vlan on trunk is 4096, can I limit this number? I need trunk pass only 10 vlans.
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May 17, 2012
We had a core switch (Cisco 4503), distribution switches(Cisco 3750) and access switches in our network and consists of many vlans. Almost all vlans uses DHCP Pools. But for few vlans DHCP is not yet configured due to initial design poblems. Recently one of the rogue user in vlan 1 connected to one of the access switch send rogue arp packets to the network (suspecting arp packet with interface vlan 1 ip of core switch with wrong mac-address (gateway ip of vlan 1)) and resulted in a prolonged network outage for the vlan 1. Any way we are going to seggregate vlan 1 into different vlans, but before that we need a temporary plan to block such kinds of attack like enabling DAI in the switch. I have checked the DAI implemenation feasibility with my knowledge and found that it is not possible to configure to the access switches(Cisco 2960) in which the user directly connected. But found that Distribution switch connected to that particular access switch seems to be able to configure since DAI commands are available to configure in switch.
Is it possible to block ARP packets with the interface vlan 1 IP Address with rogue mac-address by configuring DAI in the above mentioned Distribution switch and the port connected to the mentioned access switch?
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Feb 20, 2012
We have 2 6513 switches with SUP720/PFC3A and various POE modules and a 6748-GE-TX facing our servers. Additionally, we have a 4Gbps portchannel trunk interconnecting the switches. We have approximately 300 Nortel IP 1140e phones in use between the two switches.For the purpose of call recording, we've attempted to mirror the voice vlan using various approaches and have been met with limited success. We mirrored the VLAN using tx, rx, and both. When using both we appear to get duplicate packets at the destination interface.We seem to lose packets completely going in one direction or another for a given call. Packets are lost before they get to the destination interface?
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Jun 6, 2012
I have several closets with Cisco 3560 on the edge that I'd like to change the vlan that's used for the management vlan on each. In the core I have a Cisco 6509 with Sup720's.
I'd like to do this by changing the native vlan on the trunk port on the core 6509 interface that connects to the 3560. and leave the management vlan on the 3560 as vlan 1.
Seems trivial but what I tried didn't work and I didn't have the window to troubleshoot. I'll paste the simplified configs for the interfaces below
!
6509 configs:
!
interface Vlan50ip address 172.16.50.2 255.255.255.0!interface FastEthernet
[Code]....
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Jan 20, 2012
I need adding a vlan to the trunks bundled in port channel. I know how to add v lans to a port channel with Cisco IOS but with CAT OS.
I have 2 ports bundled to form ether channel in switch which is running CAT OS. There are already few v lans allowed in the trunk of each interface. now I need to add one more v lan.
For Example:-
v lan 135 needs to be added in addition to the existing v lans.
clear trunk1/2 1-112,115,117-134,136-4094
set trunk 1/2 on dot1q 113-114,116,135
and similarly on the 2nd interface
so if I add vlan135 to the trunk one after another will it cause any service disruption?
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Sep 24, 2012
Current Situation:We are able to reach server IP -10.203.206.40 from our 4948 switch vlan 10.30.1.0/24 through the Layer 3 interface between 4506 and 4948.
Requirements
==========
1) Now we would like to add one more L3 interface between 4506 & 4948 for redundancy purpose.
2) Make available Vlan 540 in 4948 from 4506... need to create two trunk links between 4506 & 4948 and allow vlan 540.
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Jan 8, 2013
I am trying to implement in the lab. I have 2 switches 3550 and 3750. my questions are:
1. why i can't see vlans in the running config on switch 3750 even after i created 3 vlans?
2. the 3750 is power over ethernet switch and i am trying to connect 3550 and 3750 thru cross over cable trunk link and the ports doesn't show up no light nothing. is it the right way of cabling.
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Jan 10, 2013
I have two networks at two sites with a dot1q trunk between the two L3 switches at both sites (no routers involved)
SITE A - Cisco 3750 L3 - VLAN ID 50
10.10.50.0/24
SITE B - Cisco 3750 L3 - VLAN ID 50
10.20.50.0/24
I would like to extend the SITE A VLAN to SITE B so that I can move hosts from SITE A to SITE B without needing to change their IP address but the vlan ID is already in use. Obviously the easy solution is to change the VLAN ID for one or other of the sites but both sites contain hosts that run 24/7. Is there a way to join two VLANs with different IDs together.So for example I create a new VLAN 60 at SITE B and associate it with VLAN 50 at SITE A.
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Jan 2, 2012
I need to implement the shaping VLAN only on the trunk link between the 6500 and 3560. [code]
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Oct 11, 2010
Any way to test in a lab what would happen if a tech mistakingly added "switchport voice vlan XX" to a trunk port? I am try to do some RCA on an issue and this has been identified as a possible cause by one of my techs.
The config is Switch1------Switch2--------Switch3 Each interswitch connection is configured as a dot1q trunk with all vlans allowed. The link between switch2 and 3 is where switchport voice vlan 10 was added. Switch1 is a 3750 and 2/3 are 3560's.
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Feb 9, 2011
I'm not sure if I'm missing something basic here however i though that I'd ask the question. I recieved a request from a client who is trying to seperate traffic out of a IBM P780 - one set of VIO servers/clients (Prod) is tagged with vlan x going out LAG 1 and another set of VIO server/clients (Test) is tagged with vlan y and z going out LAG 2. The problem is that the management subnet for these devices is on one subnet.
The infrastructure is the host device is trunked via LACP etherchannel to Nexus 2148TP(5010) which than connects to the distribution layer being a Catalyst 6504 VSS. I have tried many things today, however I feel that the correct solution to get this working is to use an Isolated trunk (as the host device does not have private vlan functionality) even though there is no requirement for hosts to be segregated. I have configured:
1. Private vlan mapping on the SVI;
2. Primary vlan and association, and isolated vlan on Distribution (6504 VSS) and Access Layer (5010/2148)
3. All Vlans are trunked between switches
4. Private vlan isolated trunk and host mappings on the port-channel interface to the host (P780).
I haven't had any luck. What I am seeing is as soon as I configure the Primary vlan on the Nexus 5010 (v5.2) (vlan y | private-vlan primary), this vlan (y) does not forward on any trunk on the Nexus 5010 switch, even without any other private vlan configuration. I believe this may be the cause to most of the issues I am having. Has any one else experienced this behaviour. Also, I haven't had a lot of experience with Private Vlans so I might be missing some fundamentals with this configuration.
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Mar 7, 2012
I am looking into the possibility of using private vlan's for some dmz implementations however I do have what may be some very rudimentary questions. It seems straightforward how to configure the primary/secondary vlan configuration as well as associating them. However in my case I would be looking to configure the PVLAN on a 6500-vss platform acting as the router while all of the hosts which I would desire to have in the isolated vlan would be spread out across a number of older Cisco switches which only support "protected port" setup or Procurve switches all of which I do not have budget to replace with something newer. So in my scenario I would have a 6500 connected by trunk to multiple switches which only support a protected port setup such as a Procurve (top of rack) or a Cisco 2950. As the Procurve or 2950 would not support Private VLAN setup, do I then just configure the secondary vlan to be allowed across the trunk from the 6500, configure that vlan on the Procurve or 2950 (as vtp will not foward the info for the secondary vlan) and assign that vlan to the host port as well as setting it as a protected port and this will communicate just fine across the trunk to the router as well as stopping the protected port in top of rack switch 1 from being able to communicate to a protected port in top of rack 2,3,etc? If the above scenario is what needs to be done, do I just use a regular trunk or do I have to use a PVLAN trunk?
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Nov 20, 2012
We have a low bandwith (15-20 Mbit/s) to the ASA from our Client vlan. If i connect the Client to the same vlan as the ASA is, the bandwith (90 Mbit/s) is good.
Here are the Layer 3 Design:
Client -> vlan 2 - Switch - vlan 7 -> vlan 1 - ASA 5505 -> ISP
The Layer 2 Design:
Client -> Gig2/0/13 - Switch - Gig4/0/43 -> Eth0/1 ASA5505 -> ISP
IP Address:
Client: 172.16.2.10Vlan2: 172.16.2.1Vlan7: 172.16.7.1ASA: 172.16.7.2
I assuming the switch has a problem with routing ?It is a stacked Switch with following members:
switch 1 provision ws-c3750g-12sswitch 2 provision ws-c3750g-24tsswitch 3 provision ws-c3750g-24tsswitch 4 provision ws-c3750x-48
And we have following error message in the log from the switch:
%PLATFORM_UCAST-4-PREFIX:
One or more specific prefixes could not be programmed into TCAM and are being covered by a less specific prefix, and the packets may be software forwarded I first get the idea that the switch is overloaded with router traffic. Thats why i assuming i have to check the sdm templates, but i'm not sure if this resolves the issue.
Here are the relevant config:
ASA Interface on the Switch:
interface GigabitEthernet4/0/43description ASA-inside LANswitchport access vlan 7switchport mode accessspanning-tree portfast
Client Interface on the Switch:
interface GigabitEthernet3/0/1switchport access vlan 2switchport mode accessswitchport port-securityswitchport port-security aging time 2switchport port-security violation restrictswitchport port-security aging type inactivitymacro description cisco-desktopspanning-tree portfastspanning-tree bpduguard enable
[code]...
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Oct 29, 2012
we have a chassis 6513-E and a module WS-X6748-GE-TX, I'd like to know if could I put this module in any slot, since the documentation from Cisco says that any slot from a chassis 6500-E Series can support this module. And then in the documentation of WS-X6748-GE-TX says that this module is not compatible in the slots 1-8 of the 6513 chassis, only from 9th to 13th slots, in those slots from the 6513-E we already have 4x WS-X6748-GE-TX, and we'd like to know if could we put the module in the rest of the slots. The 6513, and 6513-E is kind of confusing.
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Feb 12, 2012
we recently aquired a managed services job and have to do a overhaul of the vlan configs and have a whole dozen WC2948G's trunk between a set of ports as well as trunk out a LAG channel setup to non cisco equipment. the deal is the lacp-channel works properly on both ends but no routing of vlans between ports and between the lag trunk are working.
theres alot of settings in the config and im planning on clearing it and starting from scratch but before i do i want to know where my problem lies.
[code]...
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Apr 21, 2013
What will be the recommended connectivity of stack power cable in 6 number of 3750x switches ?
Is it similar to the stack cable ?
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Nov 2, 2011
i have an issue to connect a trunk between cisco switch and extreme switch i have many vlans that i want to cross via a link between cisco 3750 switch and a Extreme Alpine 3800 switch
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Apr 8, 2012
Randomly when I try to access to 2950 from management tools, switch is unreachable, I have to access from other switch and reload 2950.
Problem only is from managemt tool to managament vlan 1 2950.
The strange thing is that management interface is encountering a very fast increase of throttles, broadcast and ignored packets:
2950#show interfaces vlan 1
Vlan1 is up, line protocol is up
Hardware is CPU Interface, address is 0023.3488.fd65 (bia 0023.3488.fd65)
Internet address is xxxxxxxxxx
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
[code]....
It could be a hardware problem?, IOS has been upgraded.
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Oct 24, 2012
I have a network with a Catalyst 3750 as the main switch and then some Catalyst 2960 switches that are plugged in to that. I have a server running windows server 2008 with a couple of virtual machines running in Hyper-V. I created 4 VLANS listed below and gave the 3750 the following IP Address.I would like the 3750 to only be configurable from VLAN 40 but currently every VLAN can connect to it, I noticed in the standard web page settings there was a setting for "Management VLAN" but it was set to 1 and would not let me change it, I kinda assumed that was for the management port in the back.-Now the tricky part, I was trying to set up routing between the VLANs and so far I have only been able to get a sort of "all or nothing" routing to work. I can turn IP routing on and add two or more VLANs to the routing and it works fine. But what I was hoping to do is create a couple of "junction vlans" that would only route to one or two other vlans. For instance, I wanted to create a VLAN 100 that routed to VLAN 20 and 30 but nothing else. I also want to route VLAN 1 just to VLAN 30, and so on. I am able to do each one of the cases but only one, it seems like the switch only supports one "routing table" am I missing something or is this just a limitation of the switch?
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