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Webcast-Catalyst9k
New Member

bridge irb

I'm praticising on a lab with my 3550.

I know there are SVIs on the 3550, but this is an excercise.

What I did is:

3550-XL(config)# bridge irb

interface FastEthernet0/1

no switchport

no ip address

speed 100

duplex full

bridge-group 50

!

interface FastEthernet0/2

no switchport

no ip address

speed 100

duplex full

bridge-group 50

interface BVI50

ip address 192.168.5.1 255.255.255.0

+

(they should be alreeady on by default, but for consistency...)

3550-XL(config)#bridge 50 bridge ip

3550-XL(config)#bridge 50 route ip

My 2 clients (192.168.5.100 - 192.168.5.101) are connected to Fastethernet 0/1 - 0/2

but none of them can ping each other or the IP address assigned to the BVI50 interface.

If I do a:

3550-XL(config)#show interface irb

FastEthernet0/1

Routed protocols on FastEthernet0/1:

ip

Software MAC address filter on FastEthernet0/1

Hash Len Address Matches Act Type

0x00: 0 ffff.ffff.ffff 0 RCV Physical broadcast

0x8F: 0 000f.8f9a.9000 0 RCV Bridge-group Virtual Interface

0xC1: 0 0100.0ccc.cccd 0 RCV SSTP MAC address

0xC2: 0 0180.c200.0000 0 RCV IEEE spanning tree

FastEthernet0/2

Routed protocols on FastEthernet0/2:

ip

Software MAC address filter on FastEthernet0/2

Hash Len Address Matches Act Type

0x00: 0 ffff.ffff.ffff 0 RCV Physical broadcast

0x8F: 0 000f.8f9a.9000 0 RCV Bridge-group Virtual Interface

0xC1: 0 0100.0ccc.cccd 0 RCV SSTP MAC address

0xC2: 0 0180.c200.0000 0 RCV IEEE spanning tree

As you can see both have the routing protocol (IP), but there should be also a bridge protocol somewhere.

I can't figure out what's going on.

May be a wrong IOS version?

Thanks to read!

2 REPLIES
New Member

Re: bridge irb

I assume that you turned on Bridging IRB. Does your BVI show UP UP when you do a Show Ip int Brief? What do your ARP tables show? I used BVIs on two routers within the same IP subnet not quite the same thing your doing with just one side.

Re: bridge irb

3550 DOES NOT support run of the mill bridging for IP, this the reason you are not able to ping between two devices in the same bridge-group. In addition the 3550 does not support BVI, for that as you are well aware it uses SVI.

These link documents "UNSUPPORTED" commands on 3550:

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225see/scg/swuncli.htm#wp1012982

In that link you will find BVI is unsupported, bridge-group is unsupported, etc.

3550 supports Fallback Bridging for NON-IP traffic like DECnet.

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225see/scg/swfallbk.htm

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