[c-nsp] Bridging two VLANs together

[Frank Bulk]

Yes, I've read it, and the proposed topology is simple enough I don't think
the points raised in the documentation will be an issue.

Worst case, we could burn up two ethernet ports and use a cross-over cable
between the two VLANs.  

Frank

-----Original Message-----
From: Fred Reimer [mailto:freimer at ctiusa.com] 
Sent: Wednesday, December 12, 2007 2:03 PM
To: Masood Ahmad Shah; frnkblk at iname.com; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] Bridging two VLANs together

Did you mean bridge 2 protocol vlan-bridge?

I suggest you read this Cisco document before you consider doing this:

http://www.cisco.com/warp/public/473/inter-vlan_11072.pdf

HTH,

Fred Reimer, CISSP, CCNP, CQS-VPN, CQS-ISS
Senior Network Engineer
Coleman Technologies, Inc.
954-298-1697
  
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Masood Ahmad Shah
Sent: Wednesday, December 12, 2007 11:54 AM
To: frnkblk at iname.com; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Bridging two VLANs together

Well, If I understand you are talking about inter-vlan bridging. Yes it
should work fine. You may need to add 

bridge 2 protocol ieee 

It's bridge protocol global configuration command to define the type fo STP.


Regards,
Masood Ahmad Shah


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Frank Bulk
Sent: Wednesday, December 12, 2007 9:15 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Bridging two VLANs together

We have a unique situation where our transport equipment can't bridge the
traffic between two endpoints, so we would like to dump off each link's VLAN
onto our router (7609-S with WS-X6748-GE-TX blades) where it can perform the
bridging. Any reason why the following configuration wouldn't work?

interface GigabitEthernet1/31
 description Customer networks
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 221-222
 switchport mode trunk
end

interface Vlan221
 description Site 1
 no ip address
 bridge-group 2
 bridge-group 2 spanning-disabled
!
interface Vlan222
 description Site 2
 no ip address
 bridge-group 2
 bridge-group 2 spanning-disabled
!

Some of you might ask why not put the endpoints in the same VLAN, but the
endpoints don't maintain an MAC address table so there's nothing to make
them exchange traffic with each other.

Regards,

Frank

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