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Cisco Bug: CSCsz87710 - RPF enabled by default on a newly created SVI

Last Modified

Feb 15, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(32.8.11)XJC246.14 12.2(34.1.38)SBZ

Description (partial)

Symptoms: The RPF is enabled by default on a newly created SVI/loopback 
interface, which is causing ping failure. See the following example:
  switch(config)#int vlan 1103
  switch(config-if)#mtu 9216
  switch(config-if)#ip add
  switch(config-if)#ip address
  switch(config-if)# logging event link-status
  switch(config-if)# mpls ip
  switch(config-if)#no sh
  switc#sh ip interface vlan 1103
  Vlan1103 is up, line protocol is up
    Internet address is
    ::: ::::::::       :::::::::::::::::::::::
    BGP Policy Mapping is disabled
    Input features: uRPF, MCI Check   <<<<<<<<<< RPF is enabled by default
    Output features: IP Post Routing Processing, HW Shortcut Installation
    Post encapsulation features: MTU Processing, IP Protocol Output Counter, 
  Sendself Check, HW Shortcut Installation
  Type escape sequence to abort.
  Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
  Success rate is 0 percent (0/5)
Conditions: This symptom occurs when RPF is enabled on the interface for the 
first time. Delete the interface. Create the interface again with the same 
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