MPLS---Static BFD to Monitor Static LSPs

Latest reply: Jun 18, 2015 18:34:54 1838 2 0 0

MPLS---Static BFD to Monitor Static LSPs

MPLS---Static BFD to Monitor Static LSPs-1343755-1

1.     Configure OSPF between the PEs and Ps to implement IP connectivity on the backbone network.

This is common procedure, configure IP, OSPF, nothing unusual.

2.     Configure static LSPs on PEs and P to transmit network services.

I did it yesterday and I don’t think it’s hard.

3.     Configure static BFD on PEs to fast detect static LSPs. This is because faults on static LSPs can only be detected by static BFD.

Just remember that BFD session needs two parties. One is local and the other is remote. We use BFD to bind static LSP so that we can know its status by BFD.

Now we disable GE 0/0/1 of P_1, what’s going on?

The Router documentation of Huawei shows static-lsp as below is wrong. The second LSP can’t be up, instead it’s down.

[PE_1] display mpls static-lsp verbose

No             : 1

LSP-Name       : LSP1

LSR-Type       : Ingress

FEC            : 10.10.1.4/32

In-Label       : NULL

Out-Label      : 20

In-Interface   : -

Out-Interface  : GigabitEthernet1/0/0

NextHop        : 10.1.1.2

Static-Lsp Type: Normal

Lsp Status     : Up

 

No             : 2

LSP-Name       : LSP2

LSR-Type       : Ingress

FEC            : 10.10.1.4/32

In-Label       : NULL

Out-Label      : 30

In-Interface   : -

Out-Interface  : GigabitEthernet2/0/0

NextHop        : 10.3.1.2

Static-Lsp Type: Normal

Lsp Status     : Up

Why? Because it makes the cost of GE 0/0/1 of PE_1 2000, which makes the OSPF route for 10.1.1.4 cost 2000. Then the rule makes the route to 10.1.1.4 through P_2 vanish. LSP 122 can’t be up. Only the first lsp is down, then the second lsp is up, which functions as backup. BFD is used to detect status of LSP.

[PE_1]display mpls static-lsp verbose

No             : 1

LSP-Name       :   112

LSR-Type       :   Ingress

FEC            : 10.10.1.4/32

In-Label       :   NULL

Out-Label      :   20

In-Interface   :  -

Out-Interface  :  GigabitEthernet0/0/0

NextHop        :    10.1.1.2

Static-Lsp Type:  Normal

Lsp Status     :   Up

 

No             : 2

LSP-Name       :   122

LSR-Type       :   Ingress

FEC            : 10.10.1.4/32

In-Label       :   NULL

Out-Label      :   30

In-Interface   :  -

Out-Interface  :  GigabitEthernet0/0/1

NextHop        :    10.3.1.2

Static-Lsp Type:  Normal

Lsp Status     :  Down

The eNSP config file is attached. 

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user_2790689 Created Jan 30, 2015 10:38:06 Helpful(0) Helpful(0)

Thank you.
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johnston78 Created Jun 18, 2015 18:34:54 Helpful(0) Helpful(0)

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