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Cisco Bug: CSCta53273 - N7K: EIRGP equal-cost route is 'Pending'

Last Modified

Feb 01, 2017

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

4.1(5)E2

Description (partial)

Symptom:

A Nexus 7000 may have routes installed in the IPv4 RIB that are marked
as "pending", i.e. these routes have not been pushed to the FIB and
are therefore not installed in the hardware.

Example:

N7K# show routing 10.0.0.0/24
IP Route Table for VRF "default"
10.0.0.0/24, 1 ucast next-hops, 0 mcast next-hops, pending
   *via 192.168.4.2, Ethernet2/1.5, [170/51456], 00:00:10, eigrp-N7K, external

Conditions:

In theory, this issue could occur under many conditions with any
client. However, the only seen scenario, is when an EIGRP prefix is
withdrawn, e.g. due to a peer neighbour down event.

In relation to the above example, the original state is the following
ECMP route, which has been pushed to the FIB:

N7K# show routing 10.0.0.0/24
IP Route Table for VRF "default"
10.0.0.0/24, 2 ucast next-hops, 0 mcast next-hops
   *via 192.168.2.2, Ethernet2/1.4, [170/51456], 00:00:25, eigrp-N7K, external
   *via 192.168.4.2, Ethernet2/1.5, [170/51456], 00:00:25, eigrp-N7K, external

The EIGRP peer 192.168.2.2 is brought down, causing the event.
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Bug Details Include

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