Refer to the exhibit. The Main 1 and Branch 1 switches are connected directly over over an MPLS pseudowire, and both runn UDLD. After router B1 reloads because of a power failure.the pseudowire. However the Branch 1 switch is unable to reach the Main 1 switch.
Which two actions can you take to restore connrctivity and problrm from recurring? (Choose two)
A. Configure a backup pseudowire between the Main 1 and Branch 1 Switchs.
B. Issue the shutdown and no shutdown commands on the Branch 1 switch uplink to the B1 router only.
C. Configure a backup GRE tunnel between the Main 1 and Branch 1 switches.
D. Issue the shutdown and no shutdown commands on both the Branch 1 switch uplink to the B1 router and the Main 1 switch’s uplink to the M1 router
E. Enable errdisable recovery on both the Main 1 and Branch 1 switches.
F. Enable UDLD recovery on both the Main 1 and Branch 1 switches.
F is not correct. the command is errdisable recovery cause udld (udld ? says that there is no command udld recovery). just tested on a 2960S
(config)#errdisable recovery cause ?
…
udld Enable timer to recover from udld error
B,E
The issue is that UDLD between the two endpoint switches is broken.
B – “shut” followed by “no shut” will bring up the interface in err-disabled mode.
E – err-disable recovery will automatically bring up the port (after a specified time) in case this happens again.
I would say D,E.
Both sides will have errdisabled ports.
Why would you chose 1 if thr B router reloads?