1 single MPLS tunnel between routers directly connected. Traffic routes and others not?

Hello

I have a unusual problem, I can not explain.

I have a simple scenario

LAN1 = 4500 = OSPF = R1_6500 = OSPF = R2_6500 = tunnel mpls TE with Highway = R3_2900 = 1900 = LAN2

1 enable MPLS TE tunnel between the Router R2 6500 and 2900 router

2. everything is ok until I have activate the router R3 2900 highway. LAN1 can reach the printers in Lan2 via the web. ŒUVRES of ICMP in all CASES!, however, (172 bytes) ICMP packets generated by the Solarwinds network browser find only 30% of the Lan2 network...

Once you turn off highway on 2900, it works normally...

3. I have the implicit null label on 2900 and R2 6500 (if I activate highway on two tunnels), CEF seems to be ok, OSPF routes are present, however, some of the traffic simply does not pass through

4. I have it fixed construction of a second tunnel of 2900 to 6500 R1 and it works well, but I don't understand what in fact behave this way?

Hello Vadym,

Perfect :)

Why should I activate targeted Hello

[Akash]

Connected nondirectly MPLS LDP sessions

The DSL is more than one bond of his neighbor, if non-connected directly to his neighbor. For these nondirectly neighbors connected, DSL text Hello targeted as a UDP packet, but as a message specifically addressed to this DSL unicast. DSL connected nondirectly meets the Hello message and the two routers are starting to establish an LDP session. This is the so-called scope of discovery.

The default behavior of an LSR is to ignore the other DSL applications that send targeted messages to Hello. You can configure a DSL to meet the demands of targeted Hello messages by publishing the discovery ldp targeted Hello mpls accept small order.

Why do you think that the LSP is broken, if we do not use the LDP

[Akash]  If LDP is not enabled on the tunnel, R2 will not any label R3 on the tunnel interface broadcast and R3 sends the traffic untagged to R2 [only rsvp label which is implicit null], and ip lookup will happen on R2, so this is not end-to-end LSP. If ip loopup happening on the router of the base, I would say that LSP is broken here. But if LDP is enabled on the tunnel, R2 will announce a local label R3 more targeted LDP session. L3 will send labeled package [implicit null for RSVP, label IGP announced by R2] R2 and R2 will make label swapping and send traffic to R1. All the way labels switching and LSP is intact.

If it would have been scenario L3vpn, traffic would have been blackholed on router core cases get end of tunnel. In your case all core routers have routes with destination so accessibility is there but LSP divided again.

Kind regards

Assani

Tags: Cisco Support

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