Scenario:
On P2IOS-XR router what is targeted LDP hellos hold time on LDP session with 10.0.1.1:0 LDP ID?
A.
90 sec
B.
10 sec
C.
3 sec
D.
8.6 sec
Explanation:
Need to run command at PE8 router so that we can get the value .
RP/0/RSP0/CPU0:P2#show mpls ldp discovery
Local LDP Identifier: 10.0.2.1:0
Discovery Sources:
Interfaces:
GigabitEthernet0/0/0/0 (0x4000080): xmit/recv
Source address: 192.168.1.2; Transport address: 10.0.2.1
Hello interval: 3 sec (due in 1.3 sec)
LDP Id: 10.0.1.1:0
Source address: 192.168.1.1; Transport address: 10.0.1.1
Hold time: 10 sec (local:10 sec, peer:10 sec)
(expiring in 7.4 sec)
GigabitEthernet0/0/0/1 (0x40000c0): xmit/recv
Source address: 192.168.2.2; Transport address: 10.0.2.1
Hello interval: 3 sec (due in 1.6 sec)
LDP Id: 10.0.1.1:0
Source address: 192.168.2.1; Transport address: 10.0.1.1
Hold time: 10 sec (local:10 sec, peer:10 sec)
(expiring in 9.7 sec)
RP/0/RP0/CPU0:router# show mpls ldp parameters
LDP Parameters:
Protocol Version: 1
Router ID: 10.0.2.1
Null Label: Implicit
Session:
Hold time: 180 sec
Keepalive interval: 60 sec
Backoff: Initial:15 sec, Maximum:120 sec
Discovery:
Link Hellos: Holdtime:15 sec, Interval:5 sec
Targeted Hellos: Holdtime:90 sec, Interval:10 sec
Graceful Restart:
Enabled (Configured),
Reconnect Timeout: 120 sec, Forwarding State Hold: 180 sec
Timeouts:
Binding with unresolved route: 300 sec
LSD Recovery: 60 secLDP Recovery: 360 sec
# show mpls ldp neighbor detail——— ?????? Interface…
RP/0/RP0/CPU0:router# show mpls ldp neighbor detail
Peer LDP Identifier: 2.2.2.2:0
TCP connection: 2.2.2.2:11707 – 1.1.1.1:646
Graceful Restart: No
Session Holdtime: 180 sec
State: Oper; Msgs sent/rcvd: 33/29
Up time: 00:13:37
LDP Discovery Sources:
POS0/2/0/1
Targeted Hello (1.1.1.1 ->2.2.2.2, active)
Addresses bound to this peer:
23.0.0.2 2.0.0.2 123.0.4.2 10.42.37.119
10.2.2.2
Peer holdtime: 180 sec; KA interval: 60 sec; Peer state: Estab
Clients: Dir Adj Client
Inbound label filtering: accept acl ‘pfx_acl2’
Session Protection:
Enabled, state: Ready
Duration: 30 seconds
actual answer should be A. 90 sec.
Explanation: Issue on P2: show mpls ldp discovery (details).
Ps: The command show mpls ldp parameter is not Implemented.
Look at the end, you will see the hello and the holdtime values for the target neighbour. Be careful
he is asking for “targeted LDP hellos hold time”. No other command will work!!! At the end of the
show result you will see something looks like the following:
LDP discovery sources:
Targeted Hello 10.0.2.1 -> 10.0.1.1 active, passive;
Hello: 30 sec
holdtime: 90 sec