From: Jonathan V Hays (jhays@xxxxxxxx)
Date: Sat Aug 10 2002 - 14:20:17 GMT-3
You are correct that the 12.1 config and command guides do not
specifically state the mathematical basis on which the NLSP metric is
calculated, other than stating that it is based on link throughput.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
atipx_c/ipx/2cdipx.htm#xtocid49
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
atipx_r/ipx/2rdipx3.htm#xtocid94304
Even some research at www.novell.com didn't answer this question. Since
NLSP is derived from IS-IS I took a look at RFC 1142 but it is vague and
does not specify an exact formula.
It is also interesting that Novell states that the NSLP metric goes up
to 127 but Cisco says 63 is the max.
On the second question, I would think that administrative distance would
determine which route is preferred.
RIP's administrative distance is 120, EIGRP (internal) is 90
(internal), 170 (external), or 5 (summary), but I don't know what value
is assigned to NLSP.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
atipx_c/ipx/2cdipx.htm#38623
The above link states:
"Once you enable Enhanced IGRP and NLSP redistribution, the router makes
path decisions based on a predefined, nonconfigurable administrative
distance..."
>From this statement it seems clear that Cisco does have an AD for NLSP
but what is that value?
I can see I haven't helped you too much but maybe this will give you
some ideas for further research.
Jonathan
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
K Sarangan
Sent: Saturday, August 10, 2002 4:07 AM
To: Groupstudy (E-mail)
Subject: IPX Metric
Guys,
Could someone let me know how the metric is calculated in NLSP?. Also,
if a router has 3 three routes, NLSP, EIGRP and RIP, how the preference
is done. I think it is hopcount, but if it is same?. I saw the EIGRP
route is preferred over NLSP when both has same hop count.
Any links could be useful.
TIA,
Sarangan. K
Network Consultant
Cable & Wireless Enterprise
Bangalore, India
Delivering the Internet Promise
http://www.cw.com/enterprise
Phone : +91 80 8412000. Extn-3414
Mobile : +91 98453 16850
e-mail : k.sarangan@cwgoindia.com
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