From: Hazel Gachoka (hgachoka@xxxxxxxxx)
Date: Sun Nov 21 1999 - 13:48:41 GMT-3
With Cisco's implementation of traceroute, it will
round-robin between the first three best paths.
(Traceroute only shows the first three paths even
though you have multiple). For example if you have 4
availble paths, and 2 of the paths are T1 and the
other 2 are fractional T's, it will round-robin
between the first 2 T1 paths each time you traceroute
and one of the other 2 fractional Ts. Each time you
traceroute, it will drop one of the fractional T
paths.
Try configuring four paths and watch what happens.
Also connect a W/S on your segment and execute tracert
from an MS-DOS session. It shouldn't
bounce/round-robin between available paths!
Let me know if this helps.
Hazel
--- Ben Rife <brife@bignet.net> wrote:
> Make sure you don't have the statement "no ip
> route-cache" on your router's
> serial interfaces. If it is configured, it will
> round-robin switch packets
> over the available paths to the destination when
> there are multiple paths,
> independent of the routing protocol, I believe. I
> have had this problem in
> the past as well. Let me know if this helps.
>
> (26 days)
>
> Ben
>
> ----- Original Message -----
> From: Rahmlow, Howard F. <howard.rahmlow@unisys.com>
> To: <ccielab@groupstudy.com>
> Sent: Tuesday, November 09, 1999 10:24 AM
> Subject: Frame Relay and Trace Route
>
>
> > I'm using a 4500 router as a Frame switch, with 3
> routers as end points.
> The
> > Frame is fully meshed. Using the setup very close
> to Caslow pg 138.
> > Everything works fine, I can ping all the ip
> address, and telnet from one
> > router to the next with no problems. When I do a
> trace route, if the
> address
> > is not a connected router. The trace seems to
> bounce around.
> >
> > Example
> > R2501#show ip route
> > Codes: C - connected, S - static, I - IGRP, R -
> RIP, M - mobile, B - BGP
> > D - EIGRP, EX - EIGRP external, O - OSPF,
> IA - OSPF inter area
> > N1 - OSPF NSSA external type 1, N2 - OSPF
> NSSA external type 2
> > E1 - OSPF external type 1, E2 - OSPF
> external type 2, E - EGP
> > i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS
> level-2, * - candidate
> > default
> > U - per-user static route, o - ODR
> >
> > Gateway of last resort is not set
> >
> > 172.16.0.0/24 is subnetted, 3 subnets
> > C 172.16.1.0 is directly connected,
> Serial1.2
> > O 172.16.2.0 [110/128] via 172.16.1.2,
> 3d19h, Serial1.2
> > [110/128] via 172.16.3.2,
> 3d19h, Serial1.3
> > C 172.16.3.0 is directly connected,
> Serial1.3
> > R2501#trace 172.16.2.1
> >
> > Type escape sequence to abort.
> > Tracing the route to 172.16.2.1
> >
> > 1 172.16.3.2 4 msec
> > 172.16.1.2 8 msec
> > 172.16.3.2 8 msec
> > R2501#
> >
> >
> > As you can see it goes to 172.16.3.2, then to
> 172.16.1.2, then back to
> > 172.16.3.2
> >
> > Any ideas, am I missing something, I don't think
> its normal. I get the
> same
> > resault with OSPF, RIP, EIGRP ect..I also have
> reloaded all the routers a
> > few times, and get the same thing.
> >
> > Thanks
> > Howard
> >
> >
>
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