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Cisco Bug: CSCun44587 - C4k - Unequal Loadbalancing

Last Modified

Dec 13, 2018

Products (1)

  • Cisco Catalyst 4500 Series Switches

Known Affected Releases

15.1(2)SG1.151

Description (partial)

Symptom:
Topology :-



          +-------+                          Ten1/1        +---------+
          |       | Po33   +----------------+  Po23        |         |
          |       +--------+Cat4k           +--------------+ASR9k    |
          |ASR9k  +--------+                +--------------+         |
          |       |        +----------------+ Ten1/11      |         |
          |       |                                        |         |
          +-------+                                        +---------+

Conditions:
-	Observed Ten1/11 interface of Po23 is always over utilized.
-	Checked with various load balancing algorithm  but it didn't make much difference on traffic pattern.
-	 by default EC distribution is srcIP (x) dstIP. if their LDP is the only flow (i.e. from one IP add to just another IP add) there will be no distribution.

EC provides statistically good distribution only in case if number of flows is statistically significant.
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