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Cisco Bug: CSCtb97511 - BGP syn/ack packet sent out with tos 0

Last Modified

Jan 30, 2017

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

C7600 sends out BGP TCP sync/ack packets with tos 0.

- It seems that in case the opposite side router starts the BGP tcp transport connection session, once C7600 received the syc packet, it returns ack with ToS 0.

- If C7606 starts the tcp connection session , this issue does not show up. 

- if I remove "mls qos" configure, this issue does  not show up. 

- if I config "mls qos trust dscp" on the interface, this issue does  not show up.
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