I am observing 'PE route down message ' against LDP based VPLS connection on Juniper MX. The IGP protocol is IS-IS. LDP VPLS connectivity is point to point (having only two end points).
When I check status of LDP VPLS for some instance with the extensive knob , then its shows in connection history ' PE route down' along with 'status update timer'. Can someone please explain what does it mean? It is also observed in log messages that VPLS connection goes from up to down and then up again.
Below are some observations
When we check the route to LDP peer ip (targetted session) in routing table, in inet.0 route age is 'more' than in inet.3.
LDP session with targeted peer dont flap.
Below are configuration and logs .
R1> show configuration routing-instances 1784
instance-type vpls;
interface ge-2/1/5.1784;
protocols {
vpls {
encapsulation-type ethernet-vlan;
no-tunnel-services;
vpls-id 1784;
mtu 1500;
neighbor 192.168.0.18;
}
}
R1> show vpls connections instance 1784 extensive
Instance: 1784
VPLS-id: 1784
Number of local interfaces: 1
Number of local interfaces up: 1
ge-2/1/5.1784
lsi.1097220 Intf - vpls 1784 neighbor 192.168.0.18 vpls-id 1784
Neighbor Type St Time last up # Up trans
192.168.0.18(vpls-id 1784) rmt Up May 14 11:14:20 2019 1196
Remote PE: 192.168.0.18, Negotiated control-word: No
Incoming label: 262190, Outgoing label: 153422
Negotiated PW status TLV: No
Local interface: lsi.1097220, Status: Up, Encapsulation: VLAN
Description: Intf - vpls 1784 neighbor 192.168.0.18 vpls-id 1784
Flow Label Transmit: No, Flow Label Receive: No
Connection History:
May 14 11:14:20 2019 status update timer
May 14 11:14:20 2019 PE route down
May 14 11:14:15 2019 status update timer
May 14 11:14:14 2019 PE route down
May 14 10:14:20 2019 status update timer
May 14 10:14:20 2019 PE route down
May 14 10:14:15 2019 status update timer
May 14 10:14:14 2019 PE route down
May 14 09:19:43 2019 status update timer
May 14 09:19:42 2019 PE route down
May 14 09:19:38 2019 status update timer
May 14 09:19:36 2019 PE route down
May 14 09:14:20 2019 status update timer
May 14 09:14:20 2019 PE route down
May 14 09:14:15 2019 status update timer
May 14 09:14:14 2019 PE route down
May 14 08:14:20 2019 status update timer
May 14 08:14:20 2019 PE route down
May 14 08:14:15 2019 status update timer
May 14 08:14:14 2019 PE route down
R1> show route 192.168.0.18
inet.0: 47621 destinations, 141466 routes (47621 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.18/32 *[IS-IS/18] 02:53:29, metric 149
> to 192.168.7.14 via ae0.3
to 192.168.7.18 via ae15.3
inet.3: 262 destinations, 262 routes (262 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.0.18/32 *[LDP/9] 00:58:42, metric 149
> to 192.168.7.14 via ae0.3, Push 50294
to 192.168.7.18 via ae15.3, Push 670023
R1> show ldp session 192.168.0.18 detail
Address: 192.168.0.18, State: Operational, Connection: Open, Hold time: 29
Session ID: 192.168.1.35:0--192.168.0.18:0
Next keepalive in 9 seconds
Passive, Maximum PDU: 4096, Hold time: 30, Neighbor count: 1
Neighbor types: configured-layer2
Keepalive interval: 10, Connect retry interval: 1
Local address: 192.168.1.35, Remote address: 192.168.0.18
Up for 3w4d 07:43:50
The log messages are shown below :-
May 14 11:14:14.419 2019 R1 rpd[9997]: %DAEMON-5-RPD_LAYER2_VC_DOWN: State of Layer 2 VC (Neighbor : 192.168.0.18, VC-ID : 1784) changed from UP to VC-Dn
May 14 11:14:15.891 2019 R1 rpd[9997]: %DAEMON-6-RPD_LAYER2_VC_UP: State of Layer 2 VC (Neighbor : 192.168.0.18, VC-ID : 1784) changed to UP
May 14 11:14:20.085 2019 R1 rpd[9997]: %DAEMON-5-RPD_LAYER2_VC_DOWN: State of Layer 2 VC (Neighbor : 192.168.0.18, VC-ID : 1784) changed from UP to VC-Dn
May 14 11:14:20.688 2019 R1 rpd[9997]: %DAEMON-6-RPD_LAYER2_VC_UP: State of Layer 2 VC (Neighbor : 192.168.0.18, VC-ID : 1784) changed to UP