Guest

Preview Tool

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 172.16.2.1 255.255.255.0
  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 172.16.2.1/24
    ::: ::::::::       :::::::::::::::::::::::
    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, 
IP 
  Sendself Check, HW Shortcut Installation
   
  Router#ping 172.16.2.1
  
  Type escape sequence to abort.
  Sending 5, 100-byte ICMP Echos to 172.16.2.1, 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 
name.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.