From: Sage Vadi (sagevadi@yahoo.co.uk)
Date: Tue Dec 31 2002 - 22:28:51 GMT-3
Carlos,
Upon further testing I have found the following to be
true when using 12.1(5)T9.
1# distance 23 0.0.0.0 255.255.255.255 < by itself
works! But gets set on all routes (obviously).
2# distance 23 0.0.0.0 255.255.255.255 1 < by from
route address (sh ip route) based on ACL does not!
access-list 1 permit 131.10.1.4 < ACL used, this is
the router from which the routing updates are sourced
3# distance 23 0.0.0.0 255.255.255.255 14 < by
networks worked!
access-list 14 permit 192.168.1.1
access-list 14 permit 133.10.3.1
access-list 14 permit 133.10.2.64 0.0.0.63
4# distance 23 0.0.0.0 255.255.255.255 9 < by routerID
does not!
access-list 9 permit 4.4.4.4
rgds,
Sage
--- Carlos <cchorao@xtra.co.nz> wrote: > Sage , my
experience with the command is as follows
> :
>
> the syntax for the distance command is " distance
> <admin dist> <source-ip>
> < source-ip mask> <acl>
>
> Now the command will only alter the admin distance
> for routes originated
> from <source-ip> where source-ip is the router-id of
> the router originating
> the routes.
> The <source-ip mask> operates like a wildcard mask.
>
> So in your example , assume the highest addressed
> loopback address is
> 200.0.0.1/32 and you have not expressly configured
> router-id then to alter
> admin distance of all routes originated form R1 to
> 28 the command is
> "distance 28 200.0.0.1 0.0.0.0 ".
>
> The command only modifies the distance of routes
> that originate form R1 i.e
> introduced into ospf via network,redis etc, on R1
> and not routes learnt from
> other ospf routers;
>
> To achieve the results that you want , you need to
> id the router-id of R1
> and use this as the source-ip . The effect of your
> command "distance 200
> 0.0.0.1 255.255.255.252 " is to alter the distance
> of any route originated
> by a router with a router id with a binary 1 as
> its 32nd bit. ( I am
> surprised that admin distance of routes from
> 116.16.26.2 are also affected.
> Maybe 116.16.26.2 is not the router-id for that
> router ???) . I would
> appreciate you feedback on this anomaly.
>
>
>
> What do you think ?
>
>
> Carlos
> Telecom New Zealand - Advanced Solutions Group :
> Network Design and Security
>
> ----- Original Message -----
> From: "Sage Vadi" <sagevadi@yahoo.co.uk>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, December 25, 2002 4:51 PM
> Subject: OSPF: distance command
>
>
> > Merry Christmas and Happy New Year.
> >
> > Topology:
> >
> > R1-----------------------------------R2
> > 116.16.16.1/30 116.16.16.2/30
> >
> > Problem Description:
> >
> > R2 learns OSPF routes from R1. Using the distance
> > command, I configure the following in R2:
> >
> > * distance 200 116.16.16.1 255.255.255.252
> > which OSPF converts into:
> > * distance 200 0.0.0.1 255.255.255.252
> >
> > I don't have a problem if OSPF converts it.
> > But here is what happens on R2's route table:
> >
> > O IA 116.16.13.0/25 [200/74] via 116.16.16.1
> > O E1 190.190.0.0 [200/158] via 116.16.16.1
> > [200/158] via 116.16.26.2 **
> > O E2 172.16.0.0 [200/20] via 116.16.16.1
> > [200/20] via 116.16.26.2 **
> > O E2 110.110.0.0 [200/20] via 116.16.16.1
> >
> > NB: ** OSPF routes learnt from 116.16.26.2 also
> > increased to 200. Q) Why does that occur? To be
> short
> > and concise I have not drawn the other routes to
> which
> > R2 is connected to.
> >
> > My aim is to increase all the routes learnt from
> > R1/116.16.16.1 to 200. Ideas?
> >
> > rgds,
> > Sage
> >
> >
> >
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