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Cisco Bug: CSCta93771 - Permanent static route not used if less-specific alternate route present

Last Modified

Feb 03, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.4(15)T9 12.4(25a) 12.4(25b)M0.16 12.4(25b)M0.18 12.4(25c)M0.10

Description (partial)

Permanent route stays in the routing table and the CEF table, but is not used when the interface is down if a less-specific route is in the routing table (for example, a default route). 

Problem occurs when permanent static route specifies next hop interface and next-hop IP, and the next-hop interface is down and if there is a less-specific route in the routing table. Traffic should be dropped as we should take the most-specific route and there is no next-hop interface for this route, but traffic takes a the less-specific route.

Problem is seen in 12.4 mainline and 12.4(15)T, not seen in 12.4(20)T and later
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