[j-nsp] RES: LDP flaps specifically present on ACX Juniper routers (ACX4000 and ACX1100)

[Alexandre Guimaraes]

Had experienced the same thing.

After adding this to the loopback filter, the problem gone


set firewall family inet filter PROTECT-RE term aceita-ldp from protocol tcp
set firewall family inet filter PROTECT-RE term aceita-ldp from protocol udp
set firewall family inet filter PROTECT-RE term aceita-ldp from source-port 646
set firewall family inet filter PROTECT-RE term aceita-ldp from destination-port 646
set firewall family inet filter PROTECT-RE term aceita-ldp then accept

Alexandre

-----Mensagem original-----
De: juniper-nsp [mailto:juniper-nsp-bounces at puck.nether.net] Em nome de joel ahumuza
Enviada em: quinta-feira, 28 de abril de 2016 12:38
Para: juniper-nsp at puck.nether.net
Cc: tech at roketelkom.co.ug
Assunto: [j-nsp] LDP flaps specifically present on ACX Juniper routers (ACX4000 and ACX1100)

Hi All,

We are experiencing an issue with ACX routers running on 12.3X54-D20.7 where the LDP sessions are continuously flapping, the logs indicate the following;

Apr 21 03:36:31  hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: hold time expired Apr 21 03:36:34  hostname rpd[2299]: RPD_LDP_NBRDOWN: LDP neighbor x.x.x.x
(lo0.0) is down
Apr 21 03:36:38  hostname rpd[2299]: RPD_LDP_NBRDOWN: LDP neighbor x.x.x.x
(lo0.0) is down
Apr 21 03:36:38  hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: all adjacencies down Apr 21 03:55:34  hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: received notification from peer Apr 21 03:55:34  hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: received notification from peer Apr 21 03:55:35  hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: received notification from peer Apr 21 03:55:35  hostname rpd[2299]: RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason: received notification from peer

The physical connections are okay, no flaps or errors on the p2p connections We are running ISIS as the IGP, whose adjacency is stable.

Actions taken from our team was;
- Increase the hold time setting on the ldp enabled interfaces.
- Increase the time interval on the same ldp enabled interfaces.
- setting the ldp session protection setting on the ldp enabled loopback interface.

Unfortunately the actions did not yield much since the flaps have been ongoing.

Anyone have any Idea on what the problem / solution might be?

--
Blessings,

AJ.
SkypeID - jl.hmz
ahumuza-joel.blogspot.ug
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