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Cisco Bug: CSCun81738 - Tunnel not usable as EIGRP passive-interface after deletion and recreate

Last Modified

Apr 17, 2019

Products (84)

  • Cisco IOS
  • Cisco 892W Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 812 CiFi Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 2951 Integrated Services Router
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Known Affected Releases


Description (partial)

Routing protocols cannot be enabled under the tunnel interface

Tunnels disable the routing protocols on tun-to tunnels (programmatically created tunnels by apps like WCCP, L3VPN, CENT, etc.) and
will enable them back when these interfaces are being deleted, So that if these idbs are reused back in future, it wouldn't create any problem.
<<< o/p from WCCP tunnel >>> [need to enable "service internal" before running this command]
WCCP#sh idb tun 0 bits
Registered HW/SW Bits Enabled
  Tu0 HW() SW(Internal_IF)                                          <<< If this bit(Internal_IF) is set, routing protocols cannot be enable on this interface
  Tu0 0x02300800 0x00000010 0x00000800 0x00000020, 0x10000200 0x00000000, 0x00000000
The issue here is, on tunnel interface deletion, this bit is not cleared by ip-tunnels. 
And when the same idb is reused back by tunnels (for CLI, or any other tunnel)
the routing protocols cannot be enabled as this bit is still set.

Related Community Discussions

Issue with EIGRP on tunnel interface
Hello, all! I want to configure DMVPN hub on my Cisco 1921 router with 15.2(4)M7 IOS. And I have a strange message while trying to enable EIGRP on tunnel interface: gw(config-router)#no passive-interface tunnel 10 %EIGRP: interface is not allowed/supported What is the trick? --------------------------------------------------------------------- My config: interface Tunnel10  ip address  no ip redirects  ip mtu 1400  no ip next-hop-self eigrp 250  no ip split-horizon eigrp ...
Latest activity: Mar 04, 2015
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