Solved: Creating VLANs on MSFC

new_networker · ‎08-29-2008

The following set of commands in MSFC allows VLAN traffic to Cisco ACE assuming module 4 holds the ACE.

svclc multiple-vlan-interfaces

svclc module 4 vlan-group 11

svclc vlan-group 5 21,22,23,24,25,26

Do these VLANs also need to be created on the CAT6500 switch ports. If so, is it required only for server VLANs where physical connections to the switch ports are made or also for the client VLANs (i.e. where the requests come from).

Thanks.

Jon Marshall · ‎08-29-2008

With a pair of core switches a common configuration is to connect them via a Layer 2 trunk, actually ethernet trunk, but it's the same principle.

So for each vlan you have a L3 SVI for that vlan on both switches and both switches have the vlan at Layer 2. Typically you run HSRP/GLBP on the L3 interfaces and if the active switch fails then the standby switch takes over. Active/standby here refer to the L3 SVI's. The L2 trunk allows the HSRP/GLBP packets to travserse between the 2 core switches as well as vlan traffic within the same vlan.

Jon

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Jon Marshall · ‎08-29-2008

The vlans need to have been created at Layer 2 on the 6500 ie.

6500(config)# vlan 10

6500(config-vlan)# name client_vlan

OR if you are running CatOS on the supervisor

Console>(enable) set vlan 10 name client_vlan

Jon

new_networker · ‎08-29-2008

So in this case, the client vlans would just be logical VLANs without any switchports but layer 3 definition on MSFC.

Switchports will only be connected to the physical servers. Right ?

Jon Marshall · ‎08-29-2008

"the client vlans would just be logical VLANs without any switchports but layer 3 definition on MSFC"

Yes if by client vlans you mean in the context of CSM/ACE modules. There would be no switchports allocated to this vlan other than trunk ports which would have to allow these vlans or you have no failover.

Jon

new_networker · ‎08-29-2008

Could you please elaborate a bit more on the trunk port for failover purpose. How will the connectivity be made on the trunk port within two sets of 6500.

Jon Marshall · ‎08-29-2008

With a pair of core switches a common configuration is to connect them via a Layer 2 trunk, actually ethernet trunk, but it's the same principle.

So for each vlan you have a L3 SVI for that vlan on both switches and both switches have the vlan at Layer 2. Typically you run HSRP/GLBP on the L3 interfaces and if the active switch fails then the standby switch takes over. Active/standby here refer to the L3 SVI's. The L2 trunk allows the HSRP/GLBP packets to travserse between the 2 core switches as well as vlan traffic within the same vlan.

Jon