From: Danny.Andaluz@triaton-na.com
Date: Tue Sep 30 2003 - 10:58:16 GMT-3
Blanco,
According to the following link:
http://www.cisco.com/en/US/tech/tk365/tk207/technologies_tech_note09186a0080
09437d.shtml
I think I have interpreted the rules correctly. Like this example says, if
you have a metric of 20 for one route via one path and a metric of 40 for
another path to the same destination and you configure a variance of 2 under
EIGRP, traffic to this destination should be load balanced. Unless there is
some type of cutoff or something, this should work regardless of the size of
the numbers. Let me know what you think.
Thanks,
Danny
-----Original Message-----
From: Blanco Lam [mailto:b@gclamb.com]
Sent: Tuesday, September 30, 2003 9:44 AM
To: Andaluz, Danilo, Triaton/NA
Cc: ccielab@groupstudy.com
Subject: RE: EIGRP variance configs
Danny,
Think about the rules for using the "variance" command.
The fact that you offset by 2000 on R7 works but not if you "double" should
give you a good clue.
Regards,
Blanco
---- Original message ----
>Date: Mon, 29 Sep 2003 21:26:23 -0400
>From: Danny.Andaluz@triaton-na.com
>Subject: RE: EIGRP variance configs
>To: ccie@optonline.net, ccielab@groupstudy.com
>
>Here are the configs. The routes in question are the 192.177.*.0/24
>routes.
>
>R4
>
>interface Ethernet0
> ip address 137.10.74.4 255.255.255.192
> ip authentication mode eigrp 100 md5
> ip authentication key-chain eigrp 100 vlanc
> no ip route-cache
> no ip mroute-cache
>!
>!
>router eigrp 100
> variance 2
> network 137.10.74.0 0.0.0.63
> no auto-summary
> no eigrp log-neighbor-changes
>
>r4#sh 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, 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
>
> 137.10.0.0/16 is variably subnetted, 7 subnets, 5 masks
>C 137.10.4.0/24 is directly connected, Loopback0
>C 137.10.45.0/28 is directly connected, Serial0.5
>D 137.10.69.0/28 [90/2195456] via 137.10.74.6, 05:43:41, Ethernet0
>C 137.10.74.0/26 is directly connected, Ethernet0
>D 137.10.78.0/25 [90/2733056] via 137.10.74.6, 00:01:20, Ethernet0
>D 137.10.98.0/24 [90/2221056] via 137.10.74.6, 00:01:20, Ethernet0
>C 137.10.100.0/27 is directly connected, Serial0.26
>D EX 192.177.0.0/24 [170/2349056] via 137.10.74.6, 00:01:21, Ethernet0
>D EX 192.177.1.0/24 [170/2349056] via 137.10.74.6, 00:01:21, Ethernet0
>D EX 192.177.2.0/24 [170/2349056] via 137.10.74.6, 00:01:21, Ethernet0
>D EX 192.177.3.0/24 [170/2349056] via 137.10.74.6, 00:01:21, Ethernet0
>
>r4# sh ip eigrp topo 192.177.0.0 255.255.255.0
>IP-EIGRP topology entry for 192.177.0.0/24
> State is Passive, Query origin flag is 1, 1 Successor(s), FD is
>2349056
> Routing Descriptor Blocks:
> 137.10.74.6 (Ethernet0), from 137.10.74.6, Send flag is 0x0
> Composite metric is (2349056/2323456), Route is External
> Vector metric:
> Minimum bandwidth is 1544 Kbit
> Total delay is 27000 microseconds
> Reliability is 255/255
> Load is 1/255
> Minimum MTU is 1500
> Hop count is 3
> External data:
> Originating router is 192.177.3.1
> AS number of route is 0
> External protocol is Connected, external metric is 0
> Administrator tag is 0 (0x00000000)
> 137.10.74.7 (Ethernet0), from 137.10.74.7, Send flag is 0x0
> Composite metric is (4698112/4672512), Route is External
> Vector metric:
> Minimum bandwidth is 1544 Kbit
> Total delay is 118760 microseconds
> Reliability is 255/255
> Load is 1/255
> Minimum MTU is 1500
> Hop count is 3
> External data:
> Originating router is 192.177.3.1
> AS number of route is 0
> External protocol is Connected, external metric is 0
> Administrator tag is 0 (0x00000000)
>r4#
>
>r4# trace 192.177.1.1
>
>Type escape sequence to abort.
>Tracing the route to 192.177.1.1
>
> 1 137.10.74.6 20 msec 4 msec 8 msec
> 2 137.10.69.9 8 msec 8 msec 8 msec
> 3 137.10.98.100 8 msec * 8 msec
>r4#
>
>R7
>
>interface FastEthernet0
> ip address 137.10.74.7 255.255.255.192
> ip authentication mode eigrp 100 md5
> ip authentication key-chain eigrp 100 vlanc
> no ip route-cache
> no ip mroute-cache
> speed auto
>!
>router eigrp 100
> offset-list 45 out 2349056 FastEthernet0
> network 137.10.74.0 0.0.0.63
> network 137.10.78.0 0.0.0.127
> no auto-summary
> no eigrp log-neighbor-changes
>
>!
>access-list 45 permit any
>
>r7#sh ip eigrp topo 192.177.1.0 255.255.255.0
>IP-EIGRP topology entry for 192.177.1.0/24
> State is Passive, Query origin flag is 1, 1 Successor(s), FD is
>2323456
> Routing Descriptor Blocks:
> 137.10.78.8 (Serial0), from 137.10.78.8, Send flag is 0x0
> Composite metric is (2323456/409600), Route is External
> Vector metric:
> Minimum bandwidth is 1544 Kbit
> Total delay is 26000 microseconds
> Reliability is 255/255
> Load is 1/255
> Minimum MTU is 1500
> Hop count is 2
> External data:
> Originating router is 192.177.3.1
> AS number of route is 0
> External protocol is Connected, external metric is 0
> Administrator tag is 0 (0x00000000)
> 137.10.74.6 (FastEthernet0), from 137.10.74.6, Send flag is 0x0
> Composite metric is (2326016/2323456), Route is External
> Vector metric:
> Minimum bandwidth is 1544 Kbit
> Total delay is 26100 microseconds
> Reliability is 255/255
> Load is 1/255
> Minimum MTU is 1500
> Hop count is 3
> External data:
> Originating router is 192.177.3.1
> AS number of route is 0
> External protocol is Connected, external metric is 0
> Administrator tag is 0 (0x00000000
>
>
>-----Original Message-----
>From: CCIE5591 [mailto:ccie@optonline.net]
>Sent: Monday, September 29, 2003 6:07 PM
>To: Andaluz, Danilo, Triaton/NA
>Subject: RE: EIGRP variance
>
>
>Can you post the configs or just reply to me.
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Danny.Andaluz@triaton-na.com
>Sent: Monday, September 29, 2003 4:43 PM
>To: ccielab@groupstudy.com
>Subject: EIGRP variance
>
>
>Hello, Group. I am trying to get the variance command to work with
>EIGRP and
I think I'm doing it correctly, but it does not work the way I'd think it
would. Here's my topology:
>
> |--R6------R9--|
>R4--| |---BB2
> |-R7-------R8--|
>
>
>There is a loopback off of BB2 that is being learned by R4 from both R6
>and
R7. Under a normal config, R4's traffic is load balanced between R6 and R7.
To
test variance, I added an offset list to R7 outbound on the F0 doubling the
metric of what R4 sees from R6 and R7. Without Variance configured on 4, I
saw
that R4 preferred to get to the loopback via R6 and this is fine. When I
added "variance 2" under EIGRP on R4, I expected to see both routes in the
routing table and R4's traffic load balancing this traffic. This did not
happen. Instead, only the path through 6 remained. Here's the really weird
part. When I lowered the offset on R7 to 2000 instead of double, it worked
the
way it's supposed to. As I understand it this should work the way I first
tried it, but it's not. Am I missing something?
>
>Thanks,
>Danny
>
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This archive was generated by hypermail 2.1.4 : Wed Oct 01 2003 - 07:24:40 GMT-3