From: Gerard Robinson (gerardrobinson@xxxxxxxxxxxxxx)
Date: Tue Jun 27 2000 - 14:43:50 GMT-3
IP is always routed unless you issue the command 'no ip
routing' or you run CRB so putting an interface into a bridge-group
will not bridge IP unless you have specifically turned off IP routing
by issuing the aforementioned command. If you do a 'sh int irb' you
can see which protocols are bridged and which are routed. Once you
turn on routing for a protocol and then put a layer 3 address on an
interface then all traffic for that protocol is routed and not
bridged. So on a interface with an IP address and ip routing enabled
all IP traffic is always routed and non-routable traffic like
NetBIOS/SNA is bridged to DLSW and then encapsulated to IP.
One thing that confuses me is why all example configs for DLSW
from a Token Ring interface are always using source-route bridging,
you can use normal transparent bridging on Token Ring interface and it
works fine so source-route bridging is not a necessity. I think it
must be that source-route bridging is very popular in Token Ring
environments and is the bridging of choice for Token Ring.
----- Original Message -----
From: Earl Aboytes
To: ccielab@groupstudy.com
Sent: Monday, June 26, 2000 9:35 AM
Subject: IRB and DLSW+
Here is a question that I thought I had resolved until I started
reading the doc CD
Assumptions:
When you turn on dlsw in a router you have to bridge from Ethernet to
dlsw. When you turn on dlsw on a router you have to source-route
bridge from token ring to dlsw.
Question:
Did you just ruin routing of IP over the Ethernet and Token if you put
it a bridge group or turn on source route bridging?
Possible answer:
My guess is no. It seems that dlsw turns on IRB automatically. I
thought this was the answer for both token and Ethernet until I read
the following passage on the Doc CD.
Integrated routing and bridging is supported for transparent bridging,
but not for source-route bridging (SRB).
So what is the real answer? Did I lose routing of IP on my token
interface when I turned on SRB? I would guess that dlsw takes care of
this. Any thoughts on this?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Earl Aboytes
Senior Technical Conultant
GTE Managed Solutions
805-381-8817
earl.aboytes@telops.gte.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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