How can I determine the utilization of inter-VLAN routing throughput for Cisco Catalyst L3 switches?
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2 Answers
You are out of luck. L3 switches (well, the low level ones you are considering) do not have the ability to keep vlan counters. What you see in the interface is CPU bound traffic, not real traffic. That will also apply to MIB counters.
If you are willing to spare a couple of ports you could funnel the traffic through a cable and then have one vlan traffic counters. That will not scale though. Time to upgrade to a Nexus ? :) Or an ASR1k ?
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Well, this kind of ruining my day ;) I am only interested in those numbers because the client moving core routing from Cisco to Check Point for network segmentation and inline IPS/AV/AB/URLF and App control. Current switches will be replaced with updated versions, but I think they have decided to stick with Catalysts (9500 I think), but those will be predominantly responsible for L2 and, may be, site-to-site routing on both, inside and outside of the firewall cluster. Commented Apr 20, 2018 at 18:13
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I've never had one of these on my hands, so I have no experience with the kind of features on their ASICs. I guess it would be try and see if it works. But I know for sure it does not on 3560s, 3750s and the like. Commented Apr 20, 2018 at 22:34
show interface will give you utilization on a Cisco switch.
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Show interface, when executed against VLAN interface will result in: switch# show interface vlan 10 Vlan10 is up, line protocol is up Hardware is EtherSVI, address is 0005.9b78.6e7c MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, switch# Which is not helpful. I need a utilization values, i.e. min, max, avarage on all L3 VLAN to VLAN communication taking place on the switch. I do not mind polling SNMP, if need be, but am not sure what to look for. Commented Apr 12, 2018 at 12:34
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I have used
show interfaceon Vlans on many Cisco Catalyst switches, and they always have Utilization. What is the Model of your Cisco Switch?– Abu ZaidCommented Apr 12, 2018 at 12:43 -
2950, 3650 and 4510. Again, I am not interested in seeing utilization per VLAN, but the utiliza.tion of the L3 traffic routed between VLANs on the same switch or stack. Commented Apr 12, 2018 at 16:58
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There should be 5 minute input and output rate, plus load on the output for Utilization.– Abu ZaidCommented Apr 12, 2018 at 17:09
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How would you differentiate between min/max values of all the interfaces that belong to the VLAN which parameters you are viewing and the traffic routed to other VLANs? Commented Apr 12, 2018 at 19:03