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Cisco Bug: CSCtd00070 - need to block same-subnet CPE-CPE connectivity when ISG is enabled

Last Modified

Jan 29, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(33)SB7

Description (partial)

Symptoms: If "arp ignore local" is configured under "ip subscriber
l2-connected" submode on an interface, ISG will no longer reply to ARPs coming
to that interface if the ARPs' destination IPs are in the same subnet as the
ARP source's IP, or if the ARPs' destination IP is not in the subnet of ISG but
is routable from the interface where the ARP is received. 
   
Conditions: The symptom is observed if "arp ignore local" is configured under
"ip subscriber l2-connected" submode.
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