S6730 MPLS Te tunnel is not up

S6730 mpls te tunnel couldn’t create up until reboot switch

1, Check tunnel 170 configuration, tunnel-id, destination and ‘mpls te commit’ have configured, commands are right.

[S6730]dis cur int tu 170
#
interface Tunnel170
ip address unnumbered interface LoopBack0
tunnel-protocol mpls te
destination x.x.x.70
mpls te tunnel-id 1
mpls te record-route label
mpls te priority 4 3
mpls te fast-reroute
mpls te backup hot-standby mode revertive wtr 15
mpls te backup ordinary best-effort
mpls te reserved-for-binding
mpls te commit

2, Check whether CSPF has calculated successfully, after operate following commands, nothing path show, which means CSPF failed to calculate. 

[S6730]display mpls te cspf destination x.x.x.70
[S6730]display mpls ex

3, Tracert the destination ip address successfully, which means the route to x.x.x.70 exist; 

4, Check tunnel down reason as : cspf failed to calculate a path for Tunnel;

[S6730]display mpls te tunnel-interface last-error 
   Tunnel name: Tunnel170

   Error No.  : 1                         
   LSP Type   : Best-Effort LSP           LSP ID     : X.X.X.64:1:32858 
   Error Code : 0x3e8                     Occur Time : 2022-06-02 16:12:22+08:00
   Error Info : Cspf failed to calculate a path for Tunnel.

5, Check active alarm, there is an warning: network-lsa of mpls resource exceed the threshold. 

6, Though MPLS network-lsa is not enough, but if create one tunnel and this tunnel just use the existed network-lsa, the MPLS tunnel also could be up. So further whether tunnel 170 path node network-lsa exist or not. Through following output, tunnel 170 first hop x.x.x.49/50 doesn’t exist, so tunnel 170 couldn’t be up. 

Current network MPLS network-lsa resource exceed the maximum specification, when created new tunnel, if new network-lsa need create, there is no enough resource to create, then MPLS TE tunnel failed to be up. 

[Solution]

1, Replace with bigger resource switch;

2, Currently network-type is multi-access, change the link as P2P with command ‘isis circuit-type p2p’ under the interface while need run mple te at both link side. Notice: this method couldn’t operate at star topology.