Cisco 4510 Performance Monitoring

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Sep 17th, 2009
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How would you determine if your Cisco 4510 running IOS is having perfomance issues? The slots are 6Gb and I am wondering if my 48 port Gb blades are hitting this limitation. I use Solarwinds Orion NPM and monitor the switch via SNMP. I can get individual port usage information but it's difficult to determine if the slot speed is limiting this switch.

How do I determine if I need to upgrade my switch?


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Giuseppe Larosa Thu, 09/17/2009 - 13:38
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Hello Ryan,

if you mean 4548 linecards or older be aware of the following fact:

the 6GBps to and from backplane is actually divided in 6 8 ports group.

Each 8 ports group is managed by a single ASIC chip and can handle 1Gbps per direction.

from the command line we could see the performance issues during tests on new nas servers.

You can see a lot of fast increasing output drops on ports of the same 8-ports group.

So the suggestion is to look for the SNMP MIB counter for output drops for each interface.

you can use snmp object navigator



about upgrade:

if you many servers with high usage it can be a problem with these linecards

Hope to help


ryanparr9 Thu, 09/17/2009 - 14:20
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Very good info! Yes, 4548, 4448, and 4148 cards.

Using Orion I was able to pull all the info for all the ports. I am not sure how old the data is in the switch but I have a number of discards. Not as many errors though.

How do I clear this data or reset it? One reason I ask is that we had what I think was a broadcast storm recently and I haven't been able to narrow down where the issue was. This info might help me when we have the issue again.

Now... what is an acceptable or normal level of discards/errors? Should there be any at all? Would a new switch with non-blocking ports have these disacards?

ifDescr ifOutDiscards

GigabitEthernet7/11 109720022

GigabitEthernet7/16 109375956

GigabitEthernet9/17 22504409

GigabitEthernet9/26 22447137

GigabitEthernet8/8 17037786

GigabitEthernet8/38 7479270

GigabitEthernet9/14 7040013

GigabitEthernet9/16 7000380

GigabitEthernet7/24 5062349

GigabitEthernet6/47 3283903

GigabitEthernet8/2 2946203

GigabitEthernet4/20 2824037

GigabitEthernet8/4 2588855

GigabitEthernet7/35 1979764

GigabitEthernet7/47 1945553

Thanks for the help!


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