I have two 5505 Catalyst connected with a 4 port trunk. Now I have purchased a 9 gigabit port card for each one to quit the bottleneck between them. But when i connected the gigabit wire between catalyst, it caused a slow down in the network, some vlans started to go very slow, with high latency. The spantree worked fine blocking the 4 port trunk.
(The reason for buying the 9 gigabit card it´s to connect 6 more 5509 to the 2 mentioned above.)
Re: Fiber Trunk between Catalyst slow down network.
The backplane on the 5505 is limited to 3 X 1.2 Gbps, but the 5410 (9-port) Gigabit blade does do local switching. Therefore, it is very useful as an distribution card.
As far as getting slow performance, I would swap the GBICs and check the interface counters for any errors. In addition, the 5410 runs the its own software and I would recommend upgrading the software on the 5410 to the latest.
Also check to see if you are running MLS with an RSM. It certain situations, the utlization from the 5410 card can over-subscribe the Inline Rewrite capability of the Supervisor. You see if "banff" errors in the syslog if you are running into this problem.
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