Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

What does it mean Bridg-groups on interface?

Dear All,

Can you let me know what does it mean "Bridge-groups1" on interface as below:

interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
bridge-group 1
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
bridge-group 1

!

interface BVI1
ip address 192.168.1.1 255.255.255.0

the interface gi0/0 and Gi0/1 is active/active right?

Best Regards,

Rechard

4 REPLIES

Re: What does it mean Bridg-groups on interface?

Rechard,

This is part of IRB or Integrated Routing and Bridging.

With this you can Route and Bridge on the same interfaces.

The Bridge group 1 on the gig interfaces tells the router to be part of that group and the BVI1 infact represents the Bridge Group 1 to the rest of the network.(for routing)

Yes,  both the Gig interfaces should be active.

You may specify the protocol which you want to be routed too, say "bridge 1 route ip"

and for running spanning tree you need "bridge 1 protocol ieee"

New Member

Re: What does it mean Bridg-groups on interface?

Dear Tharak,

Thaks you for your reply!!!

i have some question to ask you about bridg-groups conect to Cat.3560 (2 unit). Let me detail you that:

I have cisco Router 2821 with 3 interface and Cat.3560 (2unit). i would like to connect from Cisco Router 2821 f0/0 connect to internet and f0/1,f0/2 connect to both switch ( Cat.3560) then both cat.3560 connect to access switch.

So i mean that from cisco 2821 to cat.3560 (both) i use protocol bridge-groups1 and from cat.3560 (both) connect to access .

is it possible on this ?

Note : my point i would like to do load balancing ( Active/Active)

Best Regards,

Rechard

Re: What does it mean Bridg-groups on interface?

Hi Rechard,

Yes, it should work as per your design.

You want the BVI to be the gateway for the hosts connected to both the Cats ?

By load balancing, i hope you are just segregating your Users on two different switches, if i got you right ?

New Member

Re: What does it mean Bridg-groups on interface?

BVI will participate in spanning-tree, meaning one of the physical interfaces attached should go into blocking.The interface will be up/up but only one of the two will forward traffic. If you disable spanning tree you'll only get a layer 2 loop and likely both routers will go down due to broadcast storms.

If you require load-sharing a portchannel would suit your purpose better, but you cannot channel with one interaface to two separate 3560 switches.

389
Views
0
Helpful
4
Replies