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Cisco Bug: CSCsy88134 - ES-40 Linecard doesn't react to Link layer being down

Last Modified

Feb 04, 2017

Products (1)

  • Cisco 7600 Series Routers

Known Affected Releases


Description (partial)

Symptoms: When using an ES-40 10GE linecard, if the MAC layer of the WAN
connection goes down, but the optical PCS layer remains up, the ES-40 port will
never realize the link is down and will instead always keep the interface
Up/Up. 10G ports in the ES+ family of line cards do not take advantage of link
fault signalling by peer.

Protocols relying on fast reconvergence, will not be able to take advantage of
the 10G link fault signalling.

Conditions: This problem can occur on any 10GE interface on an ES-40 line card
when the remote transceiver or repeater keeps the PCS layer up but takes the
MAC layer down. 

The Link layer detection algorithm for 10G ports in the ES+ does not consider a
Remote Fault signalled by the peer end. Thus link will continue to show as
Link-Up, even though the remote end MAC has experienced a RX FAULT and did not
happen to switch off the laser
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  • Status
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