From: Todd, Douglas M. (DTODD@PARTNERS.ORG)
Date: Thu Feb 21 2008 - 16:08:18 ARST
I'll take a stab:
We are using IRB which etitles one can bridge on one interface but route on
another. Thus we are not completely bridging and not completely routing,
brouting....
the bridge 1 bridge ip make the whole box bridge, thus the box will ignore ip
packets:
http://cisco.com/en/US/docs/optical/15000r7_0/ethernet/guide/454_327/547bridg.ht
ml
"Bridge CRB Mode
In bridge crb mode, the default sub-mode for every bridge group is to bridge but
not route the IP packets. This is similar to the no ip routing mode behavior.
But with bridge crb, packet handling is configured not globally but for the
specific bridge group. You can selectively disable bridge groups to block IP
packets or configure fallback bridging for a group of routed interfaces.
Concurrent routing and bridging is enabled with the global command bridge crb.
Enabling bridge crb disables the other modes.
The following rules help describe packet handling in this mode:
The command bridge x bridge ip (where x is a bridge-group number) configures a
bridge-group to bridge IP packets. Input interfaces and sub-interfaces belonging
to the bridge-group will follow the rules for no IP routing mode.
The command bridge x route IP (where x is a bridge-group number) configures a
bridge-group to ignore IP packets. Input interfaces and sub-interfaces belonging
to this bridge-group will follow the rules for IP routing mode (Example 6-8).
When you enable bridge crb with pre-existing bridge groups, it will generate a
bridge x route IP configuration command for any pre-existing bridge groups with
an interface configured for routing (configured with an IP address). This is a
precaution when crb is first enabled.
All of the interfaces or subinterfaces belonging to a specific bridge-group
need consistent configuration in regards to configuring or not configuring IP
addresses. Mixing interfaces configured with IP addresses and interfaces not
configured with IP addresses in the same bridge group can cause inconsistent or
unpredictable routing at the network level.
Routing between interfaces or subinterfaces that do not belong to the same
bridge group could result in inconsistent network behavior. This mode is for
routing between members of a bridge-group, but never for routing into or out of
a bridge group. "
Douglas
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
wim.depauw@getronics.com
Sent: Wednesday, February 20, 2008 2:49 PM
To: ccielab@groupstudy.com
Subject: IE Lab 16 :Frame-relay bridging
Hi,
I just configured frame-relay bridging according to the IE lab requirements but
I got a question about it:
This is the setup :
R6----ETH------R1-----FR-------R2---ETH------BB2
I configured bridging on R1/R2 with the following statements
bridge irb
int fa0/0
bridge-group 1
int s0/0
frame-relay map bridge 102 broadcast
bridge-group 1
bridge 1 protocol ieee
bridge 1 route ip
I first tried with the command bridg1 bridge ip but this didn't work . I changed
it bridge1 route ip and then all hosts were reachable.
Any idea why the bridge 1 bridge ip doesn't work ?
According to the doc cd you specify the protocols you want to route with the
command bridge 1 route XXX but the question states you should bridge and not
route....
gr
wim
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