Cisco ASR9K ARP error - wrong cable

[from88]

Hello,

We have an ASR9K device towards our network EDGE. And we've two ISPs.

After implementing bundle-ether (LAG-LACP) in one of ISP links the ARP process stopped to work at another one.

We debuged arp process and saw this:

LC/0/0/CPU0:Jun 28 13:11:55.513 : arp[117]: INCOMPLETE: Timer expired on TenGigE0/0/1/1. Retrying. Retry count 1
LC/0/0/CPU0:Jun 28 13:11:55.513 : arp[117]: ARP-PKT: send req src 152.115.122.182 d46d.5060.3419,
LC/0/0/CPU0:Jun 28 13:11:55.513 : arp[117]: dst 152.115.122.181 0000.0000.0000 if:TenGigE0/0/1/1

LC/0/0/CPU0:Jun 28 13:11:55.514 : arp[117]: ARP-PKT: rcvd rep src 152.115.122.181 a80c.0d2b.4fdb,
LC/0/0/CPU0:Jun 28 13:11:55.514 : arp[117]: dst 152.115.122.182 d46d.5060.3419 if:Bundle-Ether21

LC/0/0/CPU0:Jun 28 13:11:55.514 : arp[117]: ARP-PKT: filtered rep src 152.115.122.181 a80c.0d2b.4fdb,
LC/0/0/CPU0:Jun 28 13:11:55.514 : arp[117]: dst 152.115.122.182 d46d.5060.3419 if:Bundle-Ether21 wrong cable
LC/0/0/CPU0:Jun 28 13:11:56.494 : arp[117]: INCOMPLETE: Timer expired on TenGigE0/0/1/1. Retrying. Retry count 2

it's very strange because every p2p interface have its own /30 p2p link.

But the output says that the ARP answer for 181 IP. is hiding under other interface (Bundle-Ether21). What is not true. We guessing it could be a bug.

Any ideas ?

RP/0/RSP0/CPU0:NTGASR01#show version 
Thu Jun 28 14:15:32.266 Summer

Cisco IOS XR Software, Version 5.1.3[Default]
Copyright (c) 2015 by Cisco Systems, Inc.

ROM: System Bootstrap, Version 2.04(20140227:092320) [ASR9K ROMMON],

NTGASR01 uptime is 1 year, 48 weeks, 11 hours, 43 minutes
System image file is "bootflash:disk0/asr9k-os-mbi-5.1.3.sp6-1.0.0/0x100000/mbiasr9k-rp.vm"

cisco ASR9K Series (P4040) processor with 8388608K bytes of memory.
P4040 processor at 1500MHz, Revision 2.0
ASR-9001 Chassis

[Harold Ritter]

Could you please provide a "show runn int TenGigE0/0/1/1" and "sh runn int Bundle-Ether21".

Thanks

[from88]

RP/0/RSP0/CPU0:ASR01#show runn int TenGigE0/0/1/1
Thu Jun 28 21:54:03.757 Summer
interface TenGigE0/0/1/1
 description NIANET_ISP
 ipv4 address 152.115.128.182 255.255.255.252
 flow ipv4 monitor TEST sampler TEST_FS ingress
 flow ipv4 monitor TEST sampler TEST_FS egress
 ipv4 access-group ACL_IPv4_FROM_ISP_IN ingress
!

RP/0/RSP0/CPU0:ASR01#sh runn int Bundle-Ether21
Thu Jun 28 21:54:10.139 Summer
interface Bundle-Ether21
 description UPLINK_TO_ISP_Sentia
 ipv4 address 81.7.134.42 255.255.255.252
 flow ipv4 monitor TEST sampler TEST_FS ingress
 flow ipv4 monitor TEST sampler TEST_FS egress
 ipv4 access-group ACL_IPv4_FROM_ISP_IN ingress

Here u are, configuration is simple

[from88]

any help ?