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7.6

Cisco VLAN throughput problems

Asked by nbroughton in Miscellaneous Networking, Networking Hardware Firewalls, Network Switches & Hubs

Tags: cisco, vlan, 2950

Overview of scenerio...A complete Cisco network. 2950s used for access switches and 3550 for each building core with VLANs define at that core to route the VLANs (one VLAN per floor). If I do a throughput test with Chariot or iperf from port to port on same switch and same VLAN, I get about 86Mb on 100Mb link. No problem. That is probably the best that can be expected. When I run a test to different VLANs on the same 2950 switch connected back to the 3550 that has the VLANs defined I get only about 15 - 20 Mb throughput. I have done extensive packet captures and found that on the slower throughput I have what I think are excessive retransmissions and duplicate ACK packets (about every ten packets). The configs on the switches are pretty simple and straight forward. The amount of "other" traffic on the links is practically non existant. Does using the 3550 as a layer 3 switching lose that much capability in throughput? I thought the concept to layer 3 switching was route once, switch many so why would this affect throughput? Any thoughts are appreciated.
Nat
 
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[+][-]09/30/05 02:38 AM, ID: 14990711Accepted Solution

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Zones: Miscellaneous Networking, Networking Hardware Firewalls, Network Switches & Hubs
Tags: cisco, vlan, 2950
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Solution Provided By: Another-Dan
Participating Experts: 2
Solution Grade: B
 
[+][-]09/30/05 05:37 AM, ID: 14991469Author Comment

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[+][-]09/30/05 06:20 PM, ID: 14997147Expert Comment

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[+][-]10/02/05 11:44 AM, ID: 15002618Author Comment

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