From: Tony H. (aamercado31@xxxxxxxxx)
Date: Sat Aug 10 2002 - 16:53:17 GMT-3
I am also sort of confuse on ipx redistribution and
metric. However on my interpretation of CCO, you don't
need to be concern on metrics because by default:
1. almost all ipx routing protocol automatically
redistribute by default with exception of EIGRP/NLSP.
--I imagine that since it auto redistribute, metric,
best route, preference is taken care of automatically.
2. Also since there is auto redistribute, If I had to
advertise a route say in eigrp, I would need to do a
"no network" under rip. This implies that you (and not
the router or the metrics) have the ability to
determine which routes go into the routing table
3. If metrics do need to be involved, it seems that it
is exclusive to only the specific ipx routing protocol
itself and that the only time you need to tweak out
metrics is for redundant paths (say if nlsp sees two
redundant paths, you need to tweak the
cost/delay/etc.. to control which path you prefer it
to take)
my 2 cents and let the flames begin to correct me!!
HTH
--- Jonathan V Hays <jhays@jtan.com> wrote:
> 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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