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Is it legtimate to bridge between 2 VLAN's on a Catalyst 3548-XL

We are deploying an OEM product called Big-IP that functions something like Cisco Local Director. It is used for server load balancing and needs to act as bridge between the client and a backend VLAN housing a server farm. To conserve hardware, I'd like to take a Catalyst 3524XL-EN (or a 3548XL-EN)and split it into 2 VLAN's. Is there a problem bridging between the 2 VLAN's? i.e. Does the VLAN 1 side of the switch learn everything about what's in VLAN 2 exclusively via the bridge (and vice-versa)?

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Anonymous
N/A

Re: Is it legtimate to bridge between 2 VLAN's on a Catalyst 354

No, VLAN1 does not learn anything about VLAN2 by bridging. The only way VLAN1 would communicate with VLAN2 is by routing.

Cisco Employee

Re: Is it legtimate to bridge between 2 VLAN's on a Catalyst 354

There are no real problems linking 2 VLANs using a bridge. You have to be careful with your spanning-tree to avoid having ports into blocking state while they should not (this due to the fact that the 2 VLANs are merged in one big VLAN). You also have to be careful about the spanning-tree diameter. Regarding "learning", MAC addresses existing in VLAN1 may be learned in VLAN2 as the 2 VLANs are being merged by the bridge.

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