From: Blanco Lam (b@gclamb.com)
Date: Tue Sep 30 2003 - 11:32:41 GMT-3
Danny,
Let me give you the other half of the story... :)
http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_configuration_gu
ide_chapter09186a00800ca56b.html#4685
(watch the wrap)
It talks about IGRP but it applies to EIGRP as well. Read the entire paragraph
and see whether you click.
---- Original message ----
>Date: Tue, 30 Sep 2003 09:58:16 -0400
>From: <Danny.Andaluz@triaton-na.com>
>Subject: RE: EIGRP variance configs
>To: b@gclamb.com
>Cc: ccielab@groupstudy.com
>
> Blanco,
>
> According to the following link:
>
>
http://www.cisco.com/en/US/tech/tk365/tk207/technologies_tech_note09186a00800943
7d.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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