We have a Cisco 3750G Core switch which has physical connections, each configured as trunks to two HP Access switches. The client who uses these access switches would like to put a link between the two, but this would create a loop.
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recommend a cisco core switch and access switches in IPTV network infrastructure?I was ask to implement a network for IPTV system but i don't have idea what will be the model i will use.
Core Switch = Cisco 4503
Access Switches = Cisco 3560X
I configure 3750 stack switch as core and 2960 stack switches as access layer switches.I connected my laptop to one of my core stack in VLAN 10 and I am pinging to one of my server in VLAN 1. What will be the minimum latency at the time of inter VALN routing
View 2 Replies View RelatedIf I have two stackable switches one switch uplinks to one 6509 core switch and the other connection uplinks to another 6509 core switch, and also the other stackable switch does not connect to the core switches. Because I am using hsrp and also we are not using vss then one uplink to the core is not in used only ones is so then how does creating an etherchannel between does two uplinks to both core switches benefit me in anyway such as more bandwith and using both uplinks at the same time or I'm I wrong?
View 7 Replies View RelatedIf I have two stackable switches were only one stackable switch has two uplinks one uplink goes to one core 6509 switch and the other uplink goes to the other 6509 core switch can a Layer 3 etherchannel be used if each uplink go to a different core switch, by the way hsrp is running between both switches and also can you give an example how data will be routed from the stackable switch through the ethernetchannel to one of the core switch accross the WAN to another core switch?
View 1 Replies View RelatedWe have a couple of cisco SGE switches connected to a single DELL, between the cisco switches we have a trunk interface. I'm not sure which setting should be configured on the switches to get it working because a loop is occuring.
View 1 Replies View RelatedI have a bunch of 3750x switches that each have a 10 gig routed link back to a central 4507 (loopback = 172.30.255.255).We carved up a /24 (of course, the /24 doesn't really exist except in our address tracking spreadsheet) into a bunch of /30's for routed WAN links and /32's for loopback addresses.We started on the low end for /30 subnets (ie 172.30.255.0/30, 172.30.255.4/30, etc.).We started at the high end for the /32 loopbacks (ie 172.30.255.255/32, 172.30.255.254/32, etc.)
Well, when I try pinging 172.30.255.255 from the access layer 3750x switches, the 3750x seems to be treating it as a broadcast ping where it lists each member that responds instead of the regular !!!!! response (this makes think something is odd with the 3750x). Of course, only one member responds (the core). But even the core seems to respond with the other end of the /30 instead of the actual /32 loopback (which makes me think something is odd in the core). I could have sworn that I've setup similar topologies without problems (ie, using 10.0.0.0/32, 10.255.255.255/32, etc as loopbacks) and as long as the mask is a /32, it should work.Also, I can ping/ssh to that loopback if my laptop is on a directly connected subnet. But I can't do it from any of the 3750x switches (which are also directly connected).I've double checked for overlapping subnets, but nope. I don't see any. Routing looks fine. The actual /32 is being propagated everywhere properly.
I have a couple of 3560 switches running c3560-advipservicesk9-mz.122-44 and they are randomly experiencing the following:
- The switch locks up with no preceding error message in the log (I am forwarding syslog to Splunk).
- Upon reboot, the switch goes through the normal startup sequence with no error messages, then for some reason reloads the flash and starts all over again. (refer to doc)
This could happen after days or weeks. Sometimes they will go through two of these reloads on boot and be fine for awhile, and other times they will be stuck in the loop infinitely. I am using this same image with all of our 3560s, but am only having this issue with two of them.
We have to connect two 3750G switches to some HP machines. Those machines have several network interfaces, which are going to be configured in several bondings. The load balancing mode they want to configure is mode 6, alb. We have investigated and it is: [code] Receive load balancing is achieved through ARP negotiation.We would like to know if it is supported to be connected to a 3750G an if an special configuration is needed.
View 1 Replies View Relatedwe are using cisco 6509 series switches as core switches. and Cisco 4510,4507 series switches as edge switches. all the vlans are created at core switches and propogating to edge switches through VTP. we are using OSPF as routing protocol at core switch for internal routing. till now we are using 4510,4507 switches as layer 2 switches. Since, 4510 & 4507 switches are hign end swithces i want use them as layer 3 switches instead of layer 2.if i change these switches from layer 2 to layer 3 does it make any impact on our network or better to keep them as layer 2 switches.if i change these switches to layer 3 is there any advantage i will have.
View 3 Replies View RelatedI have issue with connectivity 3750G with Dlink Switch, it cannot connect to non-cisco switch with fiber , But CISCO to CISCO switch it shows connectivity. My question is that is there any configuration on Cisco 3750G switch to connect with non-cisco switch through fiber (SFP) ?
View 2 Replies View RelatedI have faced a problem with configuring Cisco 3750G series switches as Sever farm switches with redudance.
servers have 2NIC (1GBps) and both are bridged for redundant connections.In both switches all ports get green coluor except one port on Secondary SW. I saw some Spanning tree block port status on that switch.when i type Show cdp neghbor command on switch i can see other switch through a server connected port. Also Spannig tree root bridge election is occured through that port . Simply i need to configure both switches to pass traffic through there uplinks them selves.. but it seems like Secondry switch pass its traffic through primary switch ( i think according to STP ) usinginterconnection of bridge port of a server. [code]
In the next couple weekends I'm planning to add 2 CISCO UCS 6248UP Interconnects to 6509 Core Switches via 10G links.
Is there any impact anticipated? It's a production environment and no loss of up-time is acceptable.
I currently have 3 core switches on my campus. They are 6509 catalyst switches. They currently are not interconnected to each other.I want to interconnect them to each other. The IP addresses of each core sit on a interface Loopback500. [code] How can I interconnect each core to each other and what IP scheme could I use. I want them to be straight L3 to each other.
View 8 Replies View Relatedwe have two 6513 core switches redundant to each other by using HSRP and MST. Currently we have a problem in a CPU as it's high in both cores as appeared in the following logging message:
1: 04/09/12 16:06:20 7/-1: MAJ, GOLD,
test_sp_rp_inband_ping[7]: diag_hit_sp_sys_limit. SP-RP Ping Test skipped. Reason(s): netint_thr_active[1].
[Code].....
We have a stack of 4 Cisco WS-3750G-24TS with Sw Version 12.2(52) SE and giving weird errors:-
-Traceback= 17211C8 16FA4C0 16FA4FC 18625E4 18608D4 286A850 283E6FC 282EDF4 2859BBC 1B2EDA8 1B25878
Oct 17 22:26:48 AEDT: %SNMP-3-CPUHOG: Processing GetBulk of lldpRemEntry.7
Oct 17 22:26:50 AEDT: %SYS-3-CPUHOG: Task is running for (2098)msecs, more than (2000)msecs (8/6),process = SNMP ENGINE.
-Traceback= 172108C 17211CC 16FA4C0 16FA4FC 18625E4 18608D4 286A850 283E6FC 282EDF4 2859BBC 1B2EDA8 1B25878
Oct 17 22:26:51 AEDT: %SNMP-3-CPUHOG: Processing GetBulk of lldpRemEntry.7
Oct 17 22:26:53 AEDT: %SNMP-3-CPUHOG: Processing GetBulk of lldpRemEntry.6
Oct 17 22:26:53 AEDT: %SYS-3-CPUHOG: Task is running for (2097)msecs, more than (2000)msecs (1/1),process = SNMP ENGINE.
What are these errors is this a bug in the IOS
Assume that we have 2 Cisco 6500 series which redundant via GLP, now my question is how can we connect a Juniper SRX firewall to our core switches?
View 2 Replies View Relatedconnecting a 5548 pair to our core 6509s. Just want to be sure we don't introduce any issues into the network.The 6509's are connected and perform all the routing. Essentially, we're moving away from a 3750 stack in the data center and the 5548s are the replacement. We'd want to limit the vlans to the specific server network vlans. Our current setup is a port channel between the 3750 and each of the 2 6509s for redundancy. I'd like to use the same functionality when we connect the 5548's but I'm looking for what the config should look like to ensure no spanning tree loops are introduced and that it is configured optimally.
View 1 Replies View RelatedI have a 2x Cisco 3750G switches (Stacked) that are part of an IP Video Surveillance System .All network is set to 1 VLAN (VLAN 1 default).The Cisco SWs ( Core ) are configured with IGMP Querier + Snooping .Connected to the Cisco SWs are 4 Fiber Rings(Loops) for redundancy . RSTP and IGMP Snooping are enabled on all the network SWs .Network Architecture Figure :
When all Fiber Rings (Loops ) are connected , the Cisco and Ring SWs spanning-tree tables show the blocked and forwarding ports properly .I am able to connect all my IP Cams + Encoders to the Ring SWs and connect my Servers + WorkStations to the Cisco SWs to record and view the multicast ip streams .All streams from Rings 1 ,3 and 4 are getting normally to the Servers + WorkStations through multicast ( IGMP Snooping are filled correctly on the Cisco and non-Cisco SWs ) . All multicast streams are joined normally except for Ring 2 .The Multicast streams passing through Ring 2 will operate normally for around 2 hours then after that the Fiber SWs begin to flood their multicast traffic causing the cams on the same switch to drop off the network .
I checked the Configuration of all the SWs on Ring 2 but all are are the same .
What is weird is that I have to set all the streams to unicast to stop the flooding just on Ring 2 (All other rings are not affected ) then after some time if I enabled a video multicast stream on one of the SWs of the Ring it will be streamed properly to the Servers + WorkStations ( All IGMP tables along the way will be filled properly ) then again after 2 hours or so , the flooding will start again suddenly and all IGMP table entries for the SW on Ring2 will be empty . No problem occurs on the other Rings which have more multicast streams .
Has any come across show ver memory details on 3750G-48PS as below, One of our Catalyst 3750G running software 12.2(44)SE2 shows unexpected DRAM as below:
cisco WS-C3750G-48PS (PowerPC405) processor (revision F0) with 0K/12280K bytes of memory. This would equate to around 11MB memory which does not seem right... Is it a known IOS bug?
How i can view the capacity throughput (backplane) of core switches (6509)? How i know much is in use?
View 2 Replies View RelatedThe company I work have finally decided to enter the 21st century and invest in a new telephone system (Interactive Intelligence) to replace the legacy system which has served us well for the past 10 years. The project has only just started and involves upgrading sections of CAT3 cabling to CAT6, replacing Cisco 3550 switches in one area of the building with Cisco 4507 switches and upgrading our Core switches with Cisco Nexus 7010's. The area that concerns me most is enabling the network for qos as I have very little experience with it. At the moment Im trying to read as much documentation as I can on QOS to bring myself up to speed.
The access layer switches will consist of a mixture of Cisco 3750 & 4507 switches connected to Cisco Nexus 7010 switches which will form a collapsed aggregation & core layer.
Basically, how I should approach this daunting task of making sure the network will support VOIP.
I've been fighting what seems to be an increased number of outqueue drops on our core stack and edge switches for the last 3 or 4 weeks.(The core consists of a stack of 5 3750s in 32-gig stack mode. The wkgrp switches are 3560s. all are at 12.2.52) The wkgrp switches are directly connected to users. We use Nortel IP phones with the phone inline with the user PC. auto-neg to 100/full. [code] However I have tried turning off QOS on a couple of workgroup switches (no mls qos, but left individual port configurations the same) but am still seeing drops.Since I have disabled qos on the switches in question (no mls qos) (not the core tho) I am presuming these commands have no affect on the switch operation and therefore cannot be related to the problem. With QOS turned off one would presume that it is general congestion - especially at the user edge where busy PC issues might contribute. So I wanted to see if I could see any instances of packets in the output queues building up.
I wrote some scripts and macros that essentially did a snapshot of 'show int' every 20 seconds or so, and looked for instances of 'Queue: x/' where x was greater than zero.What I found after several days of watching the core stack, and a few of the workgroup switches that are most often displaying the behavior, was that I NEVER saw ANY packets in output queues. I often saw packets in Input queues for VLAN1, once in a great while I would see packets on input queues for fa or Gi interfaces, but NEVER on output queues. [ code] Additionally, when I look (via snmp) at interface utilization on interfaces showing queue drops (both core and wkgroup), they are occurring at ridiculously low utilization levels (as low as 4 to 8%). I've tried to look for microbursts between the core and a wkgroup switch where the core interface was experiencing drops, but haven't seen any (using observer suite). [code] While the queue-drop counts aren't critically high at this point, they are happening more frequently than in the past and I would like to understand what is going on... In most cases, no error counters are incrementing for these interfaces. Is there some mechanism besides congestion that could cause output queue drops?
We have 3 VLAN in our cisco 3750G switch. VLAN 1 10.1.0.0/24 for domain network, VLAN 2 10.2.0.0/24 for student and VLAN 3 10.3.0.0/24 for public. We have one printer 10.3.0.206 in the VLAN 3 and want to allow student server 10.2.0.253 in the VLAN 2 to access the printer. How can we configure access-list? Here is current configuration.
ip access-list extended publicaccess
permit icmp any any
permit ip any host 10.2.0.253
permit tcp any any established log
deny ip 10.3.0.0 0.0.0.255 10.1.0.0 0.0.0.255
deny ip 10.3.0.0 0.0.0.255 10.2.0.0 0.0.0.255
Lately I have been noticing mac flap messages on some of our access layer 3750G switches. Just a little background on how this is setup.
These 3750G switches are stacked and uplinked to a distribution layer 3750E stack (2 switches) via cross stacked etherchannel. (Usually 4 links) The access layer switches are stricly layer 2 where the distribution layer 3750E is routing the VLANs at the access layer to to the core 6500 switches.
I have just about ruled out physical loops on these stacks for the reason that the Macs are flapping. I am seeing this on two different stacks now each having 3 switches in the stack at the access layer. The cross stack etherchannel is spanned across the first two switches at the access layer and connected to both switches at the distribution layer. I have checked the etherchannel status and all ports appear to be part of the etherchannel and they appear fine.
The mac addressses that are flapping are just plain old desktop machines that plug directly into the access layer. I usually see this when the mac is learned on a port such as when a machine is plugged into the network or reboots.
I have been working on redesign of our network which was very challenging but almost there.We have a limited budget of around £20k(32k Dollor) Max. The cabling has been done before my time and it is very messy and cheap so you can not do a proper cisco hierarchical model at all.I can not have multiple links from each access layer switch to the core/distribution and as a result i had to connect some access switches together to introduces redundancy in a nutshell,we have two buildings, main building which has the server room in it and the other building which is just bunch of office. i have introduced a partial mesh on the normal building and have tried to introduce full mesh on the main building .
View 9 Replies View RelatedI am beginning to implement OSPF into the network I work on. I have a network which consists of multiple 4500, 6500 series routers and 3560s. Each switch has its own set of VLANs. In other words VLAN X on one switch is not the same as VLAN X on another switch. I had envisioned connecting each switch via trunk links and then routing via the loopback addresses on each device. That didn't work. Then I created a VLAN 100 on each switch. Each one was configured with an IP in the same subnet range (10.3.0.1 and 10.3.0.2). I added these addresses to the OSPF process in area 0. It worked. However, this is not desired. I have not seen many examples of 4500 layer 3 switches configured with OSPF. The examples I have seen show the interfaces configured with IPs.
View 3 Replies View RelatedI have 2 3750 switch stacks which I would like to have redundant trunks between them. This will provide two physical connections traveling through different geographical locations for redundancy in the event that a cable is severed. I couldn't find anything in regards to setup/config. Does it matter if I go stack1/switch1 to stack2/switch1 and stack1/switch2 to stack2/switch2 or should they cross to opposite switches like a stack cable? I don't think that should be necessary, but couldn't find any documentation. Should there be an issue with loops?
View 4 Replies View RelatedI'm configuring two etherchannel groups (2 ports in each) on a 3560 switch. I need to trunk multiple vlans over each channel group.
I created the vlan trunks and allowed vlans on each physical interface. I notice that I can also configure the vlan trunks on the port-channel interfaces that were created. Should I configure them under those interfaces, or leave them on the physical interfaces? Relevant config is below:
interface Port-channel1
!
interface Port-channel2
[Code].....
I have two Cisco Small Business SF 100D-16 switches, one was a spare. I have run out of ports on the first one and would like to run the other one in series to new devices across the office. I'd prefer not to buy a bigger switch at the moment, but can I run one switch into the other without any adverse effect on the network.
I'm running an optical broadband connection and so far the system is fast and stable, running 8 VOIP phones, 8 laptops and 4 printers.
I have defined a trunk between a nexus 5k and cat 3750 as a pvlan trunk - now I would like to add redundance and performance and tried to establish a vpc between my par of nexus's and the 3750 stack - but the nexus tell me that the port-channel doesn't support pvlan's - and then - ehh - do I get any benefits of running the trunk as a pvlan trunk at all?
interface Ethernet1/4
switchport mode trunk
speed 1000
switchport private-vlan trunk allowed vlan 550-552
switchport private-vlan mapping trunk 550 551-552
[code]...
Is this a good idea to connect access layer directly to core layer with fiber and omit the distribution layer?
View 2 Replies View RelatedWe have 7 3560's in 7 different locations connected to our providor for wan access. Our provider has given us a copper cable at each point and we have connected it directly to our 3560 switch at each location. Each port is configured the same way at each location. Each switch is running eigrp.All of the switch ports on each switch are configured as a trunk and vlan 299 had the ip address for the eigrp connection: [code] This setup is working as each switch see's all of the other switches as an eigrp neighbor. We have also made sure that the switch at our head office has spanning tree priority for vlan 299.
So the problem is, if there is a change in the topology at one of the locations it usually causes one or more of the other connections to go down for some reason. We just cannot pinpoint what is causing this change. There are no log's or anything other than an eigrp hold time expired message.?