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New Member

eigrp load balancing with 6 equal cost path

Greetings,

I have two sites connected using 6 T1s routing protocol is EIGRP. I have enable the maximum-path 6 command. I have CEF load balacing per packet enable on both routers interfaces.

On one side I am receving routes from 6 interfaces on the other side I am receving routes from 4 interfaces.

what am I missing here.

Thnaks for your time

7 REPLIES
Gold

Re: eigrp load balancing with 6 equal cost path

Do you have neighbors built across all six links? That's the first thing to check.... If not, then you won't have 6 paths for each route in the local table.

I wouldn't load share per packet, unless you've tested things, and out of order packets either don't matter for your application, or the T1 links are close enough in delay and such that you don't get out of orders across them.

:-)

Russ.W

New Member

Re: eigrp load balancing with 6 equal cost path

yes all the neighbors buit across six links. out of order packet is fine. I have PA-4T (3725) and 2 wic (3725) on one end and PA-4t+(7206) on other end.

Gold

Re: eigrp load balancing with 6 equal cost path

Okay--so, could you post the output of:

show ip eigrp neighbor

show ip route x.x.x.x

showing one route you expect to be reachable across all 6 of these paths?

:-)

Russ.W

New Member

Re: eigrp load balancing with 6 equal cost path

Here it goes from one side

sh ip eigrp nei

IP-EIGRP neighbors for process 1

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

6 10.64.1.105 Se2/1 11 1d07h 1 200 0 3923726

5 10.64.1.113 Se2/3 12 1d07h 4 200 0 3923727

4 10.64.1.109 Se2/2 12 1d07h 1 200 0 3923724

3 10.64.1.101 Se2/0 13 1d07h 5 200 0 3923725

0 10.64.1.17 Se1/0 12 1w0d 2 200 0 3923723

1 10.64.1.81 Se1/1 12 1w0d 1 200 0 3923722

2 10.69.2.4 Fa0/0 11 2w0d 8 200 0 160

sh ip ro 0.0.0.0

Routing entry for 0.0.0.0/0, supernet

Known via "eigrp 1", distance 170, metric 2172416, candidate default path, type external

Redistributing via eigrp 1

Last update from 10.64.1.113 on Serial2/3, 1d07h ago

Routing Descriptor Blocks:

* 10.64.1.105, from 10.64.1.105, 1d07h ago, via Serial2/1

Route metric is 2172416, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1544 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 2/255, Hops 1

10.64.1.109, from 10.64.1.109, 1d07h ago, via Serial2/2

Route metric is 2172416, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1544 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 2/255, Hops 1

10.64.1.101, from 10.64.1.101, 1d07h ago, via Serial2/0

Route metric is 2172416, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1544 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 2/255, Hops 1

10.64.1.113, from 10.64.1.113, 1d07h ago, via Serial2/3

Route metric is 2172416, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1544 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 2/255, Hops 1

New Member

Re: eigrp load balancing with 6 equal cost path

From opposite side

sh ip ro 10.69.2.0

Routing entry for 10.69.2.0/24

Known via "eigrp 1", distance 90, metric 2181120, type internal

Redistributing via eigrp 1

Last update from 10.64.1.110 on Serial1/2, 1d07h ago

Routing Descriptor Blocks:

10.64.1.110, from 10.64.1.110, 1d07h ago, via Serial1/2

Route metric is 2181120, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1536 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 1/255, Hops 1

* 10.64.1.102, from 10.64.1.102, 1d07h ago, via Serial1/0

Route metric is 2181120, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1536 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 1/255, Hops 1

10.64.1.18, from 10.64.1.18, 1d07h ago, via Serial3/3

Route metric is 2181120, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1536 Kbit

Reliability 252/255, minimum MTU 1500 bytes

Loading 88/255, Hops 1

10.64.1.82, from 10.64.1.82, 1d07h ago, via Serial4/7

Route metric is 2181120, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1536 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 52/255, Hops 1

10.64.1.106, from 10.64.1.106, 1d07h ago, via Serial1/1

Route metric is 2181120, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1536 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 1/255, Hops 1

10.64.1.114, from 10.64.1.114, 1d07h ago, via Serial1/3

Route metric is 2181120, traffic share count is 1

Total delay is 20100 microseconds, minimum bandwidth is 1536 Kbit

Reliability 255/255, minimum MTU 1500 bytes

Loading 1/255, Hops 1

Gold

Re: eigrp load balancing with 6 equal cost path

Okay, could you post one more thing from the side that's only showing four paths (this router)?

sho ip eigrp topo 0.0.0.0 0.0.0.0

Yes, you're neighbors are all up, and look good (the RTO and Q Count columns are critical here, RTO should always be something other than 5000, and the Q Count shouldn't ever be over 0 for very long at all, or it should at least be always decreasing, never hovering at some number). That you have all 6 routes on one side, and only four, though, indicates one of two things:

-- max paths isn't configured on both sides.

-- all six paths aren't equal cost within the eigrp topo table on one side.

Check the max paths on the side that's only showing four paths, just to make certain.

Thanks!

:-)

Russ.W

New Member

Re: eigrp load balancing with 6 equal cost path

Russ,

I really appreciate your inputs.

I double checked the maximum-path statement. its there.

I will check out the matrics and cost of all six interface and publish it on Monday

have a nice weekend

Ajit

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