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Cisco Bug: CSCte11547 - GSR mpls traffic is not load-balacing 50/50 from P to PE.

Last Modified

Feb 22, 2014

Products (1)

  • Cisco IOS

Known Affected Releases

12.0(32)SY8

Description (partial)

Symptom:
From P to PE traffic is load balancing 44/56 instead of 50/50.

Output rate:
POS1/1/1 (56%)
  30 second output rate 111671000 bits/sec, 258501 packets/sec
POS1/1/0 (44%)
  30 second output rate 86854000 bits/sec, 201056 packets/sec	

Which there is slight deviation from 50/50.

Output traffic (show interface):
router#sh inter pos 1/1/1
POS1/1/1 is up, line protocol is up 
  Hardware is Packet over SONET
  Internet address is 10.10.20.2/24
  MTU 4470 bytes, BW 2488000 Kbit, DLY 100 usec, rely 255/255, load
11/255
  Encapsulation HDLC, crc 32, loopback not set
  Keepalive set (10 sec)
  Scramble enabled 
  Last input 00:00:01, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
        Available Bandwidth 2395851 kilobits/sec
  30 second input rate 0 bits/sec, 1 packets/sec
  30 second output rate 111671000 bits/sec, 258501 packets/sec	<---
***output rate***
     815946441 packets input, 47327029249 bytes, 0 no buffer
     Received 0 broadcasts, 8 runts, 0 giants, 0 throttles
              0 parity
     429 input errors, 421 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     472275413 packets output, 25505662813 bytes, 0 underruns
     0 output errors, 0 applique, 2 interface resets
     0 output buffer failures, 0 output buffers swapped out
     2 carrier transitions
router#sh inter pos 1/1/0
POS1/1/0 is up, line protocol is up 
  Hardware is Packet over SONET
  Internet address is 10.10.10.2/24
  MTU 4470 bytes, BW 2488000 Kbit, DLY 100 usec, rely 255/255, load
8/255
  Encapsulation HDLC, crc 32, loopback not set
  Keepalive set (10 sec)
  Scramble enabled 
  Last input 00:00:00, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
        Available Bandwidth 2395851 kilobits/sec
  30 second input rate 1000 bits/sec, 2 packets/sec
  30 second output rate 86854000 bits/sec, 201056 packets/sec	<---
***output rate***
     798217710 packets input, 46298754463 bytes, 0 no buffer
     Received 0 broadcasts, 649 runts, 0 giants, 0 throttles
              0 parity
     2728 input errors, 2073 CRC, 0 frame, 0 overrun, 0 ignored, 6 abort
     367487430 packets output, 19847122458 bytes, 0 underruns
     0 output errors, 0 applique, 2 interface resets
     0 output buffer failures, 0 output buffers swapped out
     2 carrier transitions
router#

Conditions:
When there is two load-balancing link for a MPLS label environment.
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