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Cisco Bug: CSCur29027 - 32T1E1: Ping failure observed on 2nd multilink interface

Last Modified

Dec 11, 2015

Products (1)

  • Cisco ASR 900 Series Aggregation Services Routers

Known Affected Releases

15.5(1)S 15.5(2)S

Description (partial)

Symptom:
Ping not working properly  for 2nd multilink  interface on 32E1t1

Conditions:
1. Ping works on both ends for first multilink interface
2. Ping works only from rsp2->rsp1 for send multilink interface. 
3. Ping fails form both side after sso for multilink second interface. 


Config  on RSP1:

Ragu221_2039#Show running-config int 
Ragu221_2039#Show running-config int mul
Ragu221_2039#Show running-config int multil
Ragu221_2039#Show running-config int multilink 1
Building configuration...

Current configuration : 139 bytes
!
interface Multilink1
 ip address 10.1.1.2 255.255.255.0
 ppp multilink
 ppp multilink group 1
 ppp multilink endpoint string right1
end

Ragu221_2039#Show running-config int multilink 2
Building configuration...

Current configuration : 139 bytes
!
interface Multilink2
 ip address 10.1.1.4 255.255.255.0
 ppp multilink
 ppp multilink group 2
 ppp multilink endpoint string right2
end

Ragu221_2039#show pp
Ragu221_2039#show ppp mul
Ragu221_2039#show ppp multilink 

Multilink2
  Bundle name: left2
  Remote Endpoint Discriminator: [1] left2
  Local Endpoint Discriminator: [1] right2
  Bundle up for 00:33:51, total bandwidth 24576, load 1/255
  Receive buffer limit 192000 bytes, frag timeout 1000 ms
  Bundle is Distributed
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x0 received sequence, 0x0 sent sequence
  Member links: 16 active, 0 inactive (max 16, min not set)
    Se0/5/0:0, since 00:33:51
    Se0/5/1:0, since 00:33:50
    Se0/5/2:0, since 00:33:50
    Se0/5/3:0, since 00:33:50
    Se0/5/4:0, since 00:33:50
    Se0/5/5:0, since 00:33:48
    Se0/5/6:0, since 00:33:48
    Se0/5/9:0, since 00:33:48
    Se0/5/8:0, since 00:33:48
    Se0/5/7:0, since 00:33:48
    Se0/5/11:0, since 00:33:46
    Se0/5/12:0, since 00:33:45
    Se0/5/13:0, since 00:33:45
    Se0/5/14:0, since 00:33:45
    Se0/5/15:0, since 00:33:45
    Se0/5/10:0, since 00:33:41
          
Multilink1
  Bundle name: left1
  Remote Endpoint Discriminator: [1] left1
  Local Endpoint Discriminator: [1] right1
  Bundle up for 02:37:17, total bandwidth 19968, load 1/255
  Receive buffer limit 156000 bytes, frag timeout 1000 ms
  Bundle is Distributed
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x0 received sequence, 0x0 sent sequence
  Member links: 13 active, 3 inactive (max 16, min not set)
    Se0/3/1:0, since 02:37:17
    Se0/3/0:0, since 02:37:16
    Se0/3/4:0, since 02:37:16
    Se0/3/2:0, since 02:37:16
    Se0/3/3:0, since 02:37:16
    Se0/3/6:0, since 02:37:15
    Se0/3/5:0, since 02:37:14
    Se0/3/8:0, since 02:37:14
    Se0/3/7:0, since 02:37:14
    Se0/3/9:0, since 02:37:13
    Se0/3/12:0, since 02:37:12
    Se0/3/14:0, since 02:37:11
    Se0/3/15:0, since 02:37:11
    Se0/3/13:0 (inactive)
    Se0/3/11:0 (inactive)
    Se0/3/10:0 (inactive)
No inactive multilink interfaces
Ragu221_2039#
Ragu221_2039#
Ragu221_2039#show ip int br | i Mu
Multilink1             10.1.1.2        YES manual up                    up      
Multilink2             10.1.1.4        YES manual up                    up      
Ragu221_2039#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
Ragu221_2039#ping 10.1.1.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.3, timeout is 2 seconds:
..



Config: RSP2

Router#show running-config interface mul
Router#show running-config interface multil
Router#show running-config interface multilink 1
Building configuration...

Current configuration : 138 bytes
!
interface Multilink1
 ip address 10.1.1.1 255.255.255.0
 ppp multilink
 ppp multilink group 1
 ppp multilink endpoint string left1
end

Router#show running-config interface multilink 2
Building configuration...

Current configuration : 138 bytes
!
interface Multilink2
 ip address 10.1.1.3 255.255.255.0
 ppp multilink
 ppp multilink group 2
 ppp multilink endpoint string left2
end

Router#show pp
Router#show ppp mul
Router#show ppp multilink 

Multilink2
  Bundle name: right2
  Remote Endpoint Discriminator: [1] right2
  Local Endpoint Discriminator: [1] left2
  Bundle up for 00:35:36, total bandwidth 24576, load 1/255
  Receive buffer limit 192000 bytes, frag timeout 1000 ms
  Bundle is Distributed
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x0 received sequence, 0x0 sent sequence
  Member links: 16 active, 0 inactive (max 16, min not set)
    Se0/3/16:0, since 00:35:36
    Se0/3/17:0, since 00:35:36
    Se0/3/18:0, since 00:35:36
    Se0/3/19:0, since 00:35:36
    Se0/3/20:0, since 00:35:36
    Se0/3/21:0, since 00:35:36
    Se0/3/22:0, since 00:35:36
    Se0/3/24:0, since 00:35:36
    Se0/3/23:0, since 00:35:36
    Se0/3/25:0, since 00:35:36
    Se0/3/27:0, since 00:35:36
    Se0/3/28:0, since 00:35:36
    Se0/3/29:0, since 00:35:36
    Se0/3/30:0, since 00:35:36
    Se0/3/31:0, since 00:35:36
    Se0/3/26:0, since 00:35:36

Multilink1
  Bundle name: right1
  Remote Endpoint Discriminator: [1] right1
  Local Endpoint Discriminator: [1] left1
  Bundle up for 00:35:36, total bandwidth 19968, load 1/255
  Receive buffer limit 156000 bytes, frag timeout 1000 ms
  Bundle is Distributed
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x0 received sequence, 0x0 sent sequence
  Member links: 13 active, 3 inactive (max 16, min not set)
    Se0/3/1:0, since 00:35:36
    Se0/3/0:0, since 00:35:36
    Se0/3/3:0, since 00:35:36
    Se0/3/4:0, since 00:35:36
    Se0/3/2:0, since 00:35:36
    Se0/3/6:0, since 00:35:36
    Se0/3/5:0, since 00:35:36
    Se0/3/8:0, since 00:35:36
    Se0/3/7:0, since 00:35:36
    Se0/3/9:0, since 00:35:36
    Se0/3/12:0, since 00:35:36
    Se0/3/14:0, since 00:35:36
    Se0/3/15:0, since 00:35:36
    Se0/3/13:0 (inactive)
    Se0/3/11:0 (inactive)
    Se0/3/10:0 (inactive)
No inactive multilink interfaces
Router#show ip int br | i Mu
Multilink1             10.1.1.1        YES NVRAM  up                    up      
Multilink2             10.1.1.3        YES manual up                    up      
Router#

Router#ping 10.1.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
Router#ping 10.1.1.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.4, timeout is 2 seconds:
....!
Success rate is 20 percent (1/5), round-trip min/avg/max = 4/4/4 ms
Router#
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