From: Andy Canizares (ccie@jzr.com)
Date: Sat Jan 10 2004 - 18:53:05 GMT-3
Thanks that make sense now... What was confusing me was that when I
upped the delay between R5&R3 to 200 then the second route disappeared
from R6.
What I believe is happening is that I was making R5 the furthest router,
therefore eigrp was removing the route from R6 to prevent loops.
I created another topology to validate what you indicated the outputs
should be and it was right on target.
Thanks for your help!
Andy
-----Original Message-----
From: vdadlaney@comcast.net [mailto:vdadlaney@comcast.net]
Sent: Saturday, January 10, 2004 2:35 PM
To: Andy
Cc: ccielab@groupstudy.com
Subject: Re: EIGRP topology Question
Hi Andy,
I do not see any problems with the output. The show ip eigrp topology
with arguments will display all routes wheras without any arguments will
display only routes that are feasible successors.
The show ip eigrp topology 13.1.1.0 255.255.255.0 is telling you that
the FD is 307200 which is the FD is thru the ethernet going to R4 which
is right.
R6#sho ip eigrp topology 13.1.1.0 255.255.255.0
IP-EIGRP (AS 1): Topology entry for 13.1.1.0/24
State is Passive, Query origin flag is 1, 1 Successor(s), FD is
307200
------
Routing Descriptor Blocks:
--------------------------------------------------------------------
12.1.1.6 (Ethernet1/0), from 12.1.1.6, Send flag is 0x0
--------------------------------------------------------------------
Composite metric is (307200/281600), Route is Internal
--------------
Vector metric:
Minimum bandwidth is 10000 Kbit
Total delay is 2000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
------------------------------------------------------------------------
----
20.1.1.5 (Ethernet0/0), from 20.1.1.5, Send flag is 0x0
------------------------------------------------------------------------
----
Composite metric is (345600/320000), Route is Internal
-------------
Vector metric:
Minimum bandwidth is 10000 Kbit
Total delay is 3500 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 2
Please let me know if I am missing something? Thanks
> I have question about eigrp topology output. I think I'm seeing weird
> behavior.
>
> I have a topology which is essentially a box.
> R3---R4
> | |
> R5---R6
>
> R3/R4 network 13.1.1.0/24
> R5/R6 20.1.1.0/24
> R3/R5 12.1.1.0/30
> R4/R6 12.1.1.4/30
>
> I'm looking at the "sho ip route", "sho ip eigrp topology" and "show
> ip topology 13.1.1.0 255.255.255.0" commands.
>
> Based on the metrics, from R6 I would expect to see that the preferred
> path is via R4. Referring to the show commands this is what I see.
>
> What I'm having a problem understanding is the "show ip topology
> 13.1.1.0 255.255.255.0" command. The path to 13.1.1.0 still displays
> via R5 (20.1.1.5) even though the Advertised distance for 13.1.1.0
> from R5 (320000) is greater than the FD (307200). Is this the correct
> behavior?
>
> This doesn't seem right to me since it does not meet the feasible
> condition (assuming I understand it correctly).
>
> Tia,
> Andy
> R6#
> R6#sho ip eigrp top
> R6#sho ip rou
> Codes: C - connected, S - static, 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
> i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS
inter
> area
> * - candidate default, U - per-user static route, o - ODR
> P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> 55.0.0.0/24 is subnetted, 2 subnets
> D EX 55.55.55.0 [170/284160] via 12.1.1.6, 00:00:42, Ethernet1/0
> D EX 55.5.5.0 [170/284160] via 12.1.1.6, 00:00:42, Ethernet1/0
> 20.0.0.0/24 is subnetted, 1 subnets
> C 20.1.1.0 is directly connected, Ethernet0/0
> 66.0.0.0/24 is subnetted, 2 subnets
> C 66.2.2.0 is directly connected, Loopback0
> D EX 66.1.1.0 [170/409600] via 20.1.1.5, 00:02:22, Ethernet0/0
> 10.0.0.0/24 is subnetted, 1 subnets
> D EX 10.1.1.0 [170/284160] via 12.1.1.6, 00:00:42, Ethernet1/0
> 11.0.0.0/30 is subnetted, 2 subnets
> D EX 11.1.1.0 [170/284160] via 12.1.1.6, 00:00:42, Ethernet1/0
> D EX 11.1.1.4 [170/284160] via 12.1.1.6, 00:00:42, Ethernet1/0
> 12.0.0.0/30 is subnetted, 2 subnets
> C 12.1.1.4 is directly connected, Ethernet1/0
> D 12.1.1.0 [90/320000] via 20.1.1.5, 00:00:53, Ethernet0/0
> 13.0.0.0/24 is subnetted, 1 subnets
> D 13.1.1.0 [90/307200] via 12.1.1.6, 00:00:43, Ethernet1/0
> R6#sho ip eigrp top
> R6#sho ip eigrp topology
> IP-EIGRP Topology Table for AS(1)/ID(66.2.2.2)
>
> Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
> r - reply Status, s - sia Status
>
> P 12.1.1.4/30, 1 successors, FD is 281600
> via Connected, Ethernet1/0
> P 10.1.1.0/24, 1 successors, FD is 284160, tag is 11
> via 12.1.1.6 (284160/258560), Ethernet1/0
> P 11.1.1.0/30, 1 successors, FD is 284160, tag is 11
> via 12.1.1.6 (284160/258560), Ethernet1/0
> P 12.1.1.0/30, 1 successors, FD is 307200
> via 20.1.1.5 (320000/294400), Ethernet0/0
> P 13.1.1.0/24, 1 successors, FD is 307200
> via 12.1.1.6 (307200/281600), Ethernet1/0
> P 11.1.1.4/30, 1 successors, FD is 284160, tag is 11
> via 12.1.1.6 (284160/258560), Ethernet1/0
> P 20.1.1.0/24, 1 successors, FD is 281600
> via Connected, Ethernet0/0
> P 55.55.55.0/24, 1 successors, FD is 284160, tag is 11
> via 12.1.1.6 (284160/258560), Ethernet1/0
> P 55.5.5.0/24, 1 successors, FD is 284160, tag is 11
> via 12.1.1.6 (284160/258560), Ethernet1/0
> P 66.1.1.0/24, 1 successors, FD is 409600
> via 20.1.1.5 (409600/128256), Ethernet0/0
> P 66.2.2.0/24, 1 successors, FD is 128256
> via Rconnected (128256/0)
>
>
> R6#sho ip eigrp topology 13.1.1.0 255.255.255.0
> IP-EIGRP (AS 1): Topology entry for 13.1.1.0/24
> State is Passive, Query origin flag is 1, 1 Successor(s), FD is
307200
> Routing Descriptor Blocks:
> 12.1.1.6 (Ethernet1/0), from 12.1.1.6, Send flag is 0x0
> Composite metric is (307200/281600), Route is Internal
> Vector metric:
> Minimum bandwidth is 10000 Kbit
> Total delay is 2000 microseconds
> Reliability is 255/255
> Load is 1/255
> Minimum MTU is 1500
> Hop count is 1
> 20.1.1.5 (Ethernet0/0), from 20.1.1.5, Send flag is 0x0
> Composite metric is (345600/320000), Route is Internal
> Vector metric:
> Minimum bandwidth is 10000 Kbit
> Total delay is 3500 microseconds
> Reliability is 255/255
> Load is 1/255
> Minimum MTU is 1500
> Hop count is 2
> R6#
>
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