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labrat
Posts: 29
Registered: ‎04-14-2009
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transport ldp target hellos over different AS domains

Hi:

 

Is there anyway to transport ldp target hellos across different AS domains? assume IGP for those domains are IS-IS.

 

 

Distinguished Expert
mikep
Posts: 483
Registered: ‎06-30-2009

Re: transport ldp target hellos over different AS domains

Hi,

 

Targeted Hello is just an UDP packet with dest IP address of remote PE (not a multicast address 224.0.0.2).  IMHO it should not be a problem to transport Targeted LDP Hello packet as long as you leak /32 IP addresses of remote PE routers between AS.

 

Kind Regards

Michael Pergament

Juniper Networks

 

Contributor
labrat
Posts: 29
Registered: ‎04-14-2009
0

Re: transport ldp target hellos over different AS domains

Thanks Mike:

 

Well I think, in order for two target hellos see each other and creats a neighbor/ajacency, without creating regular LDP a cloud in bewteen, somehow there must be ptp tunnel between them and this tunnel is capable of deliverying ldp packets, as the knob "ldp-tunlling" under the defintion of MPLS LSP.

 

Otherwise, in one IGP domain, two remote LDP loopback interfaces will form adjacency, without even enbling LDP everywhere.

 

Just wondering there is any way I could create a MPLS LSP cross two different autonomous systems (both running IS-IS). 

 

 

Distinguished Expert
mikep
Posts: 483
Registered: ‎06-30-2009

Re: transport ldp target hellos over different AS domains

Hi,

 

Well I think, in order for two target hellos see each other and creats a neighbor/ajacency, without creating regular LDP a cloud in bewteen, somehow there must be ptp tunnel between them and this tunnel is capable of deliverying ldp packets, as the knob "ldp-tunlling" under the defintion of MPLS LSP.

[Michael] Right. In this case however you would need RSVP running also between ASBRs.

 

What are you trying to achieve (establish L2 VPN, martini)?In this case I would rather go with BGP-based L2 VPN as it suppors Interprovider VPNs (no LDP or RSVP between ASBRs).

 

Kind Regards

Michael Pergament

 

Contributor
labrat
Posts: 29
Registered: ‎04-14-2009
0

Re: transport ldp target hellos over different AS domains

well, the assumption is that there are cisco routers in another ASN. in this case we have to use Martini L2VPN (juniper term L2circuit).
Visitor
Faruk
Posts: 1
Registered: ‎10-15-2009
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Re: transport ldp target hellos over different AS domains

I am trying to establish l2circuit over two different IGP ( different AS ). so i have to deploy ldp session between PE routers.

LDP session goes up over IGP cloud so i redistributed PE loopback /32 to our IGP cloud ( OSPF ). Also the same rules applied in other AS domain. 

 

But ldp session flaps so many and there is no connectivity between our l2circut ;

 

 

re0> show ldp session ---------------- extensive   
Address: -----------------, State: Operational, Connection: Open, Hold time: 14
  Session ID: -----/--/------

  Next keepalive in 4 seconds
  Active, Maximum PDU: 4096, Hold time: 30, Neighbor count: 1
  Neighbor types: configured-layer2
  Keepalive interval: 10, Connect retry interval: 1
  Local address: local loopback, Remote address: Remote loopback
  Up for 00:00:15
  Last down 00:00:16 ago; Reason: received unexpected EOF
  Number of session flaps: 14309
  Local - Restart: disabled, Helper mode: enabled
  Remote - Restart: disabled, Helper mode: disabled
  Local maximum recovery time: 240000 msec
  Nonstop routing state: Not in sync
  Queue depth: 0
Message type               Total                     Last 5 seconds
                       Sent      Received          Sent      Received
Initialization        22816         14310               0             0
Keepalive             53453         26398             1             0
Notification              0             0             0             0
Address               14316             1             0             0
Address withdraw          6             0             0             0
Label mapping        735787          3547             0             0
Label request             0             0             0             0
Label withdraw           13            66             0             0
Label release            66             4             0             0
Label abort               0             0             0             0

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