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Cisco Bug: CSCun22933 - Tunnel interface goes down when tunnel source uses backup interface cfg

Last Modified

Nov 27, 2020

Products (2)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 2600 Series Multiservice Platforms

Known Affected Releases

15.2(4)M 15.3(3)M 15.4(1)T1

Description (partial)

Symptom:
As soon as GigabitEthernet0/1 [the backup interface] is configured with an ip address [which is the same as GigabitEthernet0/0 / the tunnel source ip address], the tunnel interface goes down

Conditions:
An Ethernet interface [GigabitEthernet0/0] has another Ethernet interface [gigabitEthernet0/1] configured as backup interface. i.e. both have the same ip address configured and GigabitEthernet0/1 is supposed to be in standby/down mode as long as GigabitEthernet0/0 is up/up.

This IP address from GigabitEthernet0/0 [and 0/1] is used as the Tunnel source of a GRE/IPSec Tunnel interface.
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