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Cisco Bug: CSCun79878 - Loopback routes for interfaces not cleaned up after interface deletion

Last Modified

Nov 27, 2020

Products (1)

  • Cisco IronPort Security Management Appliance Software

Known Affected Releases


Description (partial)

You may find that an IP address that should otherwise be reachable cannot be reached from your Cisco Content Security Management Appliance (SMA) due to a loopback route for that IP being in the SMA's routing table.

The routing table can be viewed using the command:

netstat -nr

Example output:

Routing tables

Destination        Gateway            Flags    Refs      Use  Netif Expire
default           UGS         0     1496  Mana~t           link#3             UHS         0        0    lo0      link#2             U           0     1697  Mana~t        link#3             UHS         1     1645    lo0          link#4             UH          0 24654828    lo0

NOTE: In the above example, the loopback routes are the items that use the lo0 interface.

This defect is only known to occur after an IP interface had the this IP address is deleted.

The reason for this issue is that loopback routes are created for the local IP addresses on the appliance, however, they are not deleted if that IP address is deleted.
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