RE: One bridge question.

From: Eric Whitlock (eric.whitlock@xxxxxxxxxxxxx)
Date: Tue Apr 17 2001 - 12:38:03 GMT-3

   
Did a quick test in the lab and found that turning the 4k into a bridge
,without any ip address and ip routing disabled, and putting an IP address
onto the 2521's serial interface did not work. I could not ping the serial
interface on the 2521.

I configured IRB on the 2521 ,with bridging and routing enabled for IP on
this router, removed the IP address off the serial, moved it onto the IRB
interface and put bridging onto the serial interface. With this config I
could ping the IRB interface from the PC(in my case it was another router).

It looks like IP routing should be completely disabled on the 4000 acting as
the bridge, otherwise it will probably try to route IP and bridge any other
protocols. What also worked for me was to once again enable IRB on the 4000
and use the command "bridge 1 bridge ip" - which seems to be default when
you enable IRB.

Here are the configs of the various routers, the models are not the same:

Perhaps IONS would make a difference to this scenario?

4000 

----
version 11.2
!
hostname 4000
!
!
ip subnet-zero
no ip domain-lookup
!
interface Ethernet0
 no ip address
 bridge-group 1
!
interface Serial0
 no ip address
 bridge-group 1
!
!
ip classless
no logging console
!
bridge irb
bridge 1 protocol ieee
4000#
4000#sh int irb

Ethernet0

 Bridged protocols on Ethernet0:
  appletalk  clns       decnet     ip
  vines      apollo     ipx        xns

 Software MAC address filter on Ethernet0
  Hash Len    Address      Matches  Act      Type
  0x00:  0 ffff.ffff.ffff        42 RCV Physical broadcast
  0x2A:  0 0900.2b01.0001         0 RCV DEC spanning tree
  0x3E:  0 00d0.58ad.4266         5 RCV Interface MAC address
  0xC0:  0 0100.0ccc.cccc        31 RCV CDP
  0xC2:  0 0180.c200.0000       113 RCV IEEE spanning tree

Serial0

 Bridged protocols on Serial0:
  appletalk  clns       decnet     ip
  vines      apollo     ipx        xns

 Software MAC address filter on Serial0
  Hash Len    Address      Matches  Act      Type
  0x00:  0 ffff.ffff.ffff         7 RCV Physical broadcast
  0x2A:  0 0900.2b01.0001         0 RCV DEC spanning tree
  0x3E:  0 00d0.58ad.4266         0 RCV Interface MAC address
  0xC0:  0 0100.0ccc.cccc         0 RCV CDP
  0xC2:  0 0180.c200.0000         0 RCV IEEE spanning tree
4000#

2521
----

version 12.0
hostname 2521
!
ip subnet-zero
no ip domain-lookup
bridge irb
!
interface Serial1/0
 no ip address
 no ip directed-broadcast
 no ip mroute-cache
 no fair-queue
 clockrate 2015232
 bridge-group 1
!
interface BVI1
 ip address 172.16.1.1 255.255.255.0
 no ip directed-broadcast
!
ip classless
!
!
bridge 1 protocol ieee
 bridge 1 route ip
!
2521#sh int irb

Serial1/0

 Routed protocols on Serial1/0:
  ip

 Bridged protocols on Serial1/0:
  appletalk  clns       decnet     ip
  vines      apollo     ipx        xns

 Software MAC address filter on Serial1/0
  Hash Len    Address      Matches  Act      Type
  0x00:  0 ffff.ffff.ffff        23 RCV Physical broadcast
  0x0F:  0 0050.0fda.8400         0 RCV Interface MAC address
  0x2A:  0 0900.2b01.0001         0 RCV DEC spanning tree
  0x58:  0 0000.0cc1.f354        19 RCV Bridge-group Virtual Interface
  0xC0:  0 0100.0ccc.cccc         0 RCV CDP
  0xC2:  0 0180.c200.0000         0 RCV IEEE spanning tree
  0xC2:  1 0180.c200.0000         0 RCV IBM spanning tree

BVI1

 Routed protocols on BVI1:
  ip

Hope this helps.

Regards,
Eric

-----Original Message-----
From: Chad Sullivan [mailto:chsulliv@cisco.com]
Sent: 17 April 2001 16:45
To: Luo Zheng; ccielab@groupstudy.com
Subject: RE: One bridge question.

Rest of network---2521---SER---4000---Eth---Client

just assign the 4K's ser and eth in the same bridge-group.

S1
bridge-group 1

E1
bridge-group 1

Bridge 1 protocol ieee

You do not need to assign IP's to the 4K's interfaces (unless you would like
to ping/telnet to it) then you can assign an IP on the PC and Ser of 2521
within the same subnet (using the IP on the 2521 as the gateway for the PC).
You should be able to now connect to and through the 2521.

Chad Sullivan
RTP, NC
CCIE #6493

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Luo Zheng
Sent: April 17, 2001 9:12 AM
To: ccielab@groupstudy.com
Subject: One bridge question.

Hi, group!

The case is:
One 2521 is connected to one 4000 with serial port, and briging is enabled
on 4000.
One PC is connected to the ether port on 4000.
The pc and the serial port on 2521 belong to the same ip subnet.
I want the 4000 act as a bridge to connect the PC and 2521.

How can I do with it?
Which type of bridge can I use to complete the task??

Thanks a lot.

lz
**Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
**********************************************************************

The information in this e-mail is confidential and is legally privileged.
It is intended solely for the addressee.  If this email is not intended for
you, you cannot copy, distribute, or disclose the included information
to any-one

If you are not the intended recipient please delete the mail. Whilst
all reasonable steps have been taken to ensure the accuracy and
integrity of all data transmitted electronically, no liability is accepted
if the data, for whatever reason, is corrupt or does not reach it's
intended destination.
All business is undertaken, subject to our standard trading conditions
which are available on request.

*******************************************************************
**Please read:http://www.groupstudy.com/list/posting.html

This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:29:47 GMT-3