Performance issue on LAN ( using GLBP and RSTP)

[imranfbhatti]

Hi all,

I am facing Performance problems in our LAN.

We have 6 Vlans , one of which is server vlan others are users Vlans.

Problem is that when i ping from users Vlan to Servers Vlan i found high latency ( like 20 to 30 msec)

We are using two catalyst 4506 at core Connected with each other using 2Gbps etherchannel and dosens of L2 switches( L2)Connected with both Core switches.

Also we are using GLBP for load balancing .

I think this is simple configurations but i am stuck as no way has been found to get rid of high latency.

Also worth mentioning that some time ping response is normal but most of the time there is trouble.

Can seome body please help me.

Thanks

[imranfbhatti]

"insure one L3 core switch is gateway for all VLANs."

so how do we insure the redundancy in this case .

secondly in this case HSRP is better than GLBP ? or one l3 switch for routing and same switch is the root bridge for all vlans ?

[Joseph W. Doherty]

"so how do we insure the redundancy in this case . "

As you've already guessed, HSRP rather than GLBP.

"secondly in this case HSRP is better than GLBP ?"

It could be if in fact you do have asymetrical routing, and moving from GLBP to HSRP precludes it.

There may be other approaches, such as adjust MAC timers, but unless you really need the performance of a 2nd gateway (do you?), I think the primary/secondary approach is a bit simpler.

"or one l3 switch for routing and same switch is the root bridge for all vlans ? "

It probably would make sense for the primary L3 switch to the root bridge.

PS:

Do know, don't know this is your problem. You haven't posted enough detail information, but with two core L3 switches and GLBP, it might be an issue (also with you spanning VLANs across multiple switches - not doing so allows unicast flooding to be a non-issue, but that might be an even bigger topology change for you).