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Verify the LSP Again
Purpose
After taking the appropriate action to correct the error, the LSP needs to be checked again to confirm that the problem in the data link layer has been resolved.
Action
From the ingress, egress, and transit routers, verify that the LSP is up and traversing the network as expected:
user@host> show mpls lsp extensive
Sample Output 1
user@R1> show mpls lsp extensive
Ingress LSP: 1 sessions
10.0.0.6
From: 10.0.0.1 , State: Up, ActiveRoute: 1 , LSPname: R1-to-R6
ActivePath: (primary)
LoadBalance: Random
Encoding type: Packet, Switching type: Packet, GPID: IPv4
*Primary State: Up
Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 20)
10.1.13.2 S 10.1.36.2 S
Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt):
10.1.13.2 10.1.36.2
145 Sep 30 12:25:01 Selected as active path
144 Sep 30 12:25:01 Record Route: 10.1.13.2 10.1.36.2
143 Sep 30 12:25:01 Up
142 Sep 30 12:25:01 Originate Call
141 Sep 30 12:25:01 CSPF: computation result accepted
140 Sep 30 12:24:32 CSPF failed: no route toward 10.0.0.6[74 times]
139 Sep 30 11:48:57 Deselected as active
138 Sep 30 11:48:56 CSPF failed: no route toward 10.0.0.6
137 Sep 30 11:48:56 Clear Call
136 Sep 30 11:48:56 CSPF: link down/deleted 10.1.36.1(R3.00/10.0.0.3)->10.1.36.2(R6.00/10.0.0.6)
[...Output truncated...]
Created: Sat Jul 10 18:18:43 2004
Total 1 displayed, Up 1 , Down 0
Egress LSP: 1 sessions
10.0.0.1
From: 10.0.0.6 , LSPstate: Up, ActiveRoute: 0
LSPname: R6-to-R1, LSPpath: Primary
Suggested label received: -, Suggested label sent: -
Recovery label received: -, Recovery label sent: -
Resv style: 1 FF, Label in: 3, Label out: -
Time left: 134, Since: Thu Sep 30 12:24:56 2004
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 6 receiver 39024 protocol 0
PATH rcvfrom: 10.1.13.2 (so-0/0/2.0) 7 pkts
Adspec: received MTU 1500
PATH sentto: localclient
RESV rcvfrom: localclient
Record route: 10.1.36.2 10.1.13.2 <self>
Total 1 displayed, Up 1, Down 0
Transit LSP: 0 sessions
Total 0 displayed, Up 0, Down 0
Sample Output 2
user@R6> show mpls lsp extensive
Ingress LSP: 1 sessions
10.0.0.1
From: 10.0.0.6, State: Up, ActiveRoute: 1, LSPname: R6-to-R1
ActivePath: (primary)
LoadBalance: Random
Encoding type: Packet, Switching type: Packet, GPID: IPv4
*Primary State: Up
Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 20)
10.1.36.1 S 10.1.13.1 S
Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt):
10.1.36.1 10.1.13.1
50 Sep 30 12:24:12 Selected as active path
49 Sep 30 12:24:12 Record Route: 10.1.36.1 10.1.13.1
48 Sep 30 12:24:12 Up
47 Sep 30 12:24:12 Originate Call
46 Sep 30 12:24:12 CSPF: computation result accepted
45 Sep 30 12:23:43 CSPF failed: no route toward 10.0.0.1[73 times]
44 Sep 30 11:48:12 Deselected as active
43 Sep 30 11:48:12 CSPF failed: no route toward 10.0.0.1
42 Sep 30 11:48:12 CSPF: link down/deleted 10.1.36.2(R6.00/10.0.0.6)->10.1.36.1(R3.00/10.0.0.3)
[...Output truncated...]
Created: Tue Aug 17 12:18:34 2004
Total 1 displayed, Up 1, Down 0
Egress LSP: 1 sessions
10.0.0.6
From: 10.0.0.1 , LSPstate: Up, ActiveRoute: 0
LSPname: R1-to-R6, LSPpath: Primary
Suggested label received: -, Suggested label sent: -
Recovery label received: -, Recovery label sent: -
Resv style: 1 FF, Label in: 3, Label out: -
Time left: 159, Since: Thu Sep 30 12:24:16 2004
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 19 receiver 44251 protocol 0
PATH rcvfrom: 10.1.36.1 (so-0/0/3.0) 4 pkts
Adspec: received MTU 1500
PATH sentto: localclient
RESV rcvfrom: localclient
Record route: 10.1.13.1 10.1.36.1 <self>
Total 1 displayed, Up 1, Down 0
Transit LSP: 0 sessions
Total 0 displayed, Up 0, Down 0
Sample Output 3
user@R3> show mpls lsp extensive Ingress LSP: 0 sessions Total 0 displayed, Up 0, Down 0 Egress LSP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit LSP: 2 sessions 10.0.0.1 From: 10.0.0.6 , LSPstate: Up, ActiveRoute: 1 LSPname: R6-to-R1, LSPpath: Primary Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: 3 Resv style: 1 FF, Label in: 100176, Label out: 3 Time left: 143, Since: Thu Sep 30 12:21:25 2004 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 6 receiver 39024 protocol 0 PATH rcvfrom: 10.1.36.2 (so-0/0/3.0) 10 pkts Adspec: received MTU 1500 sent MTU 1500 PATH sentto: 10.1.13.1 (so-0/0/2.0) 9 pkts RESV rcvfrom: 10.1.13.1 (so-0/0/2.0) 9 pkts Explct route: 10.1.13.1 Record route: 10.1.36.2 <self> 10.1.13.1 10.0.0.6 From: 10.0.0.1 , LSPstate: Up, ActiveRoute: 1 LSPname: R1-to-R6, LSPpath: Primary Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: 3 Resv style: 1 FF, Label in: 100192, Label out: 3 Time left: 148, Since: Thu Sep 30 12:21:30 2004 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 19 receiver 44251 protocol 0 PATH rcvfrom: 10.1.13.1 (so-0/0/2.0) 9 pkts Adspec: received MTU 1500 sent MTU 1500 PATH sentto: 10.1.36.2 (so-0/0/3.0) 9 pkts RESV rcvfrom: 10.1.36.2 (so-0/0/3.0) 9 pkts Explct route: 10.1.36.2 Record route: 10.1.13.1 <self> 10.1.36.2 Total 2 displayed, Up 2, Down 0
Sample Output 4
user@R1> show configuration protocols mpls
label-switched-path R1-to-R6 {
to 10.0.0.6;
}
inactive: interface so-0/0/0.0;
inactive: interface so-0/0/1.0;
interface so-0/0/2.0;
user@R6> show configuration protocols mpls
label-switched-path R6-to-R1 {
to 10.0.0.1;
}
inactive: interface so-0/0/0.0;
inactive: interface so-0/0/1.0;
inactive: interface so-0/0/2.0;
interface so-0/0/3.0;
user@R3> show configuration protocols mpls
interface fxp0.0 {
disable;
}
inactive: interface so-0/0/0.0;
inactive: interface so-0/0/1.0;
interface so-0/0/2.0;
interface so-0/0/3.0;
Meaning
Sample Outputs 1 and 2 from ingress router R1 and egress router R6, respectively, show that the LSP is now traversing the network along the expected path, from R1 through R3 to R6, and the reverse LSP, from R6 through R3 to R1.
Sample Output 3 from transit router R3 shows that there are two transit LSP sessions, one from R1 to R6 and the other from R6 to R1.
Sample Output 4 shows the interfaces that were deactivated on the ingress, egress, and transit routers, forcing the LSP to take the intended path. If these interfaces were not deactivated, even though the configuration is now correct, the LSP would still traverse the network through the alternate path.
