[c-nsp] UDLD misbehaviour

[Leonardo Gama Souza]

Hello my friends,

I had some problems on an optical fibre between two 6509 switches and
UDLD
kicked in to avoid STP loops, but when the switch tried to recover from
the error-disable state,
the link went up, even with optical fibre problems.
This misbehaviour caused a major outage in the network. I couldn't find
any known bug for the
current IOS version 12.2(33)SXI3.
I worked around the issue keeping the interface in a shutdown state
until I
resolved the cabling issue.
Can someone shed some light on the solution?

09:20:24.737: %LINEPROTO-5-UPDOWN: Line protocol on Interface
TenGigabitEthernet2/4/10, changed state to down
09:20:24.757: %LINK-3-UPDOWN: Interface TenGigabitEthernet2/4/10,
changed state to
down
09:20:24.994: %PM-SW2_SPSTBY-4-ERR_DISABLE: udld error detected on
Te2/4/10,
putting Te2/4/10 in err-disable state
09:20:24.710: %UDLD-SW1_SP-4-UDLD_PORT_DISABLED: UDLD disabled interface
Te2/4/10,
aggressive mode failure detected
09:20:24.710: %PM-SW1_SP-4-ERR_DISABLE: udld error detected on Te2/4/10,
putting
Te2/4/10 in err-disable state
09:20:25.203: %LINEPROTO-SW1_SP-5-UPDOWN: Line protocol on Interface
TenGigabitEthernet2/4/10, changed state to down
09:20:25.203: %LINK-SW1_SP-3-UPDOWN: Interface TenGigabitEthernet2/4/10,
changed
state to down
09:20:55.004: %PM-SW1_SP-4-ERR_RECOVER: Attempting to recover from udld
err-disable
state on Te2/4/10
09:20:55.119: %PM-SW2_SPSTBY-4-ERR_RECOVER: Attempting to recover from
udld
err-disable state on Te2/4/10
09:20:56.362: %LINK-3-UPDOWN: Interface TenGigabitEthernet2/4/10,
changed state to
up
09:20:56.333: %LINK-SW1_SP-3-UPDOWN: Interface TenGigabitEthernet2/4/10,
changed
state to up
 
 I will really appreciate any input.

 Cheers.