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Cisco Bug: CSCup44799 - ASR9k BNG-Suppress local ARP entries for each IPoE subscriber interface

Last Modified

Feb 16, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.2.BASE

Description (partial)

Symptom:
On an ASR9k acting as a BNG aggregating IPoE subscribers, a local ARP entry is added for each spawned IPoE subscriber interface, for each local IP address on the associated unnumbered subscriber loopback, contributing to ARP scale limitations:

RP/0/RSP0/CPU0:ASR9010-C#sh arp | i Bundle-Ether333.210.ip2
Tue Jun 17 21:08:50.043 UTC
10.1.1.1        -          8478.ac2e.1eb6  Interface  ARPA  Bundle-Ether333.210.ip2
10.2.2.1        -          8478.ac2e.1eb6  Interface  ARPA  Bundle-Ether333.210.ip2
10.3.3.1        -          8478.ac2e.1eb6  Interface  ARPA  Bundle-Ether333.210.ip2
10.4.4.1        -          8478.ac2e.1eb6  Interface  ARPA  Bundle-Ether333.210.ip2
10.5.5.1        -          8478.ac2e.1eb6  Interface  ARPA  Bundle-Ether333.210.ip2

interface Loopback64
 ipv4 address 10.1.1.1 255.255.255.0
 ipv4 address 10.2.2.1 255.255.255.0 secondary
 ipv4 address 10.3.3.1 255.255.255.0 secondary
 ipv4 address 10.4.4.1 255.255.255.0 secondary
 ipv4 address 10.5.5.1 255.255.255.0 secondary

Conditions:
This is behavior is present in IOS-XR through 4.3.4 and 5.1.2 for ASR 9000s acting as a BNG aggregating IPoE subscribers.
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