From: Tom Martin (tig@wiltecinc.com)
Date: Fri Jul 23 2004 - 23:43:55 GMT-3
Ken,
The maps are used to let the router know which L3 addresses map to which
remote DLCI (or dial string and authentication name for ISDN) and also
indicate whether the specified remote will receive broadcast/multicast
traffic. Based on that, to get ISIS across Frame Relay or ISDN you just
need to make a mapping for CLNS and mark the circuit as broadcast. You
would only specify a net in a mapping if you wanted
non-broadcast/multicast CLNS traffic to map to a remote (just like you
do for IP). For ISIS traffic doing so is not required.
As to the question of whether CLNS for both nets will cross the link,
that depends on how you configure ISIS. ISIS may become adjacent for L1
and/or L2, depending on the nets configured (for L1). Additional
adjacencies will not form if additional nets are configured. You can
also configure ISIS for multiple areas to explicitly limit which nets
run over which interfaces.
Hopefully that clears it up a little.
--Tom
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Kenneth Wygand
Sent: Friday, July 23, 2004 10:15 PM
To: ccielab@groupstudy.com
Subject: mapping CLNS over frame or ISDN
I'm a little confused when mapping CLNS over Frame or ISDN to get ISIS
to work. I know the 'net' variable is one of the attributes that can be
configured as part of this mapping, but I don't believe it is required.
Is the 'net' attribute available to simply limit the propagation of CLNS
packets across a F/R or ISDN circuit when the packets are destined for a
net which is not available across the F/R or ISDN cloud?
For example, let's say I have two nets on a given router, one for area
00.0001 and one for area 00.0002. Suppose these are both configured on
my single router. Now if I have a F/R or ISDN circuit and I want to map
CLNS, do I need to have the 'net' attribute to provide this mapping for
CLNS to traverse the circuit? If not, will CLNS packets on both nets
pass over the circuit? If I specify a particular net, say 00.0001, then
will only nets for 00.0001 propagate the circuit?
Thanks in advance for any explanation.
Kenneth E. Wygand
Systems Engineer, Project Services
CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
Network+, A+
Custom Computer Specialists, Inc.
"I am not really smart. I just stick with problems longer."
-Albert Einstein
Custom Computer Specialists, Inc.
"Celebrating 25 Years of Excellence"
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