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Webcast-Catalyst9k
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Incorrect Load Sharing in MPLS/TE

Hi,

I set ip two TE to ease the traffic congestion in the direct links with the following path :

SH Network : 9.185.24.0/22

Tunnel 0 : HK-->SH load share factor:3

Tunnel 1: HK-->GZ-->BJ-->SH load share factor:1

However, after the tunnels are up, most of the traffic, about 900Kbps, loads on Tunnel 1 and only 200Kbps loads on Tunnel 0. I check the routing and the cef table and they all indicates correct load share ratio but the actual load sharing turns incorrect. Here is the router display:

hkibmcw2#sh ip route 9.185.24.0 255.255.252.0

Routing entry for 9.185.24.0/22

Known via "ospf 108", distance 110, metric 56, type inter area

Routing Descriptor Blocks:

* directly connected, via Tunnel0

Route metric is 56, traffic share count is 3

directly connected, via Tunnel1

Route metric is 56, traffic share count is 1

hkibmcw2#sh ip cef 9.185.24.0 int

9.185.24.0/22, version 1934, per-destination sharing

0 packets, 0 bytes

tag information set

local tag: 75

via 0.0.0.0, Tunnel0, 0 dependencies

traffic share 3

next hop 0.0.0.0, Tunnel0

valid adjacency

tag rewrite with Tu0, point2point, tags imposed {}

via 0.0.0.0, Tunnel1, 0 dependencies

traffic share 1

next hop 0.0.0.0, Tunnel1

valid adjacency

tag rewrite with Tu1, point2point, tags imposed {97}

0 packets, 0 bytes switched through the prefix

tmstats: external 0 packets, 0 bytes

internal 0 packets, 0 bytes

Load distribution: 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 (refcount 1)

Does anyone encounter this kind of senarios ? What is the cause of the problem ? Is it a software bug ?

Best Regards

Raymond Lo

1 REPLY

Re: Incorrect Load Sharing in MPLS/TE

Often times complex troubleshooting issues are best addressed in an interactive session with one of our trained technical assistance engineers. While other forum users may be able to help, it’s often difficult to do so for this type of issue.

To utilize the resources at our Technical Assistance Center, please visit http://www.cisco.com/tac and to open a case with one of our TAC engineers, visit http://www.cisco.com/tac/caseopen

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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