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Cisco Bug: CSCvv58332 - ASA/FTD is reading BGP MP_REACH_NLRI attribute's next-hop bytes in reverse order

Last Modified

Oct 27, 2020

Products (1)

  • Cisco Adaptive Security Appliance (ASA) Software

Known Affected Releases

6.4(0.0) 6.5(0) 6.6

Description (partial)

Currently ASA/FTD code reverses the next-hop byte order contained in the BGP MP_REACH_NLRI path attribute

> show bgp neighbors routes
BGP table version is 8, local router ID is
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale, m multipath
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop        Metric LocPrf Weight  Path
*                                  0  13879 65000 ?

The appliance is forming adjacency with another BGP speaking router and that peer router advertises prefix using MP_REACH_NLRI attribute for IPv4 unicast AF.
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