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  • 1.  MPLS | FRR | Cisco | Juniper | Compatibility

    This message was posted by a user wishing to remain anonymous
    Posted 8 days ago
    This message was posted by a user wishing to remain anonymous

    I have the following scenario and need your guidance on enabling a detour within Juniper to ensure seamless switchover for LSPs originating and terminating on Cisco devices. PFB topology

    LSPs: lsp1 and lsp2 (I think we can only use dynamic path when using the below scenario). Configuration is available below for Cisco. Please note lsp is currently up but takes time when interface flaps, tears down the primary path, recompute the backup and then bring up the lsp which introduces delays and customer faces disconnection during this period. 

    Objective: If path-1 flaps, we want transit routers (R2 and R3) to switch over to path-2 locally and forward the new path to the Cisco routers. This should happen without signaling back to Cisco (R1 and R2) to tear down path-1 and bring up path-2, as this process introduces delays affecting customer connectivity.

    Could you advise on the necessary configurations or features(bypass lsp etc.) within Juniper to achieve this? would appreciate your assistance. 

    Configuration on Cisco: 


    interface Tunnel12
     ip unnumbered Loopback0
     tunnel mode mpls traffic-eng
     tunnel destination 10.10.10.10
     tunnel mpls traffic-eng path-option 10 dynamic
     tunnel mpls traffic-eng fast-reroute



  • 2.  RE: MPLS | FRR | Cisco | Juniper | Compatibility

    Posted 8 days ago
    Edited by Erin York 6 hours ago

    Original Message:
    Sent: 03-08-2025 21:48
    From: Anonymous
    Subject: MPLS | FRR | Cisco | Juniper | Compatibility

    This message was posted by a user wishing to remain anonymous

    I have the following scenario and need your guidance on enabling a detour within Juniper to ensure seamless switchover for LSPs originating and terminating on Cisco devices. PFB topology

    LSPs: lsp1 and lsp2 (I think we can only use dynamic path when using the below scenario). Configuration is available below for Cisco. Please note lsp is currently up but takes time when interface flaps, tears down the primary path, recompute the backup and then bring up the lsp which introduces delays and customer faces disconnection during this period. 

    Objective: If path-1 flaps, we want transit routers (R2 and R3) to switch over to path-2 locally and forward the new path to the Cisco routers. This should happen without signaling back to Cisco (R1 and R2) to tear down path-1 and bring up path-2, as this process introduces delays affecting customer connectivity.

    Could you advise on the necessary configurations or features(bypass lsp etc.) within Juniper to achieve this? would appreciate your assistance. 

    Configuration on Cisco: 


    interface Tunnel12
     ip unnumbered Loopback0
     tunnel mode mpls traffic-eng
     tunnel destination 10.10.10.10
     tunnel mpls traffic-eng path-option 10 dynamic
     tunnel mpls traffic-eng fast-reroute