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network_stuff:arista:mpls

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network_stuff:arista:mpls [2026/03/14 21:46] – jotasandokunetwork_stuff:arista:mpls [2026/03/15 00:06] (current) – jotasandoku
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 == Modes: shortest-path , explicit , PCE(controller)== == Modes: shortest-path , explicit , PCE(controller)==
 In the **shortest-path mode the label encodes the destination it stays __the same__ (the last router label) the entire journey. Eg: P2 router receives the last router's label (doesn't change) looks it up in its LFIB, finds "next hop toward the last router is P3, outgoing label (same label)", forwards it. Each P router has a LFIB that __has been synchronized via ISIS__ so they know what is the next hop as soon as they check the label** In the **shortest-path mode the label encodes the destination it stays __the same__ (the last router label) the entire journey. Eg: P2 router receives the last router's label (doesn't change) looks it up in its LFIB, finds "next hop toward the last router is P3, outgoing label (same label)", forwards it. Each P router has a LFIB that __has been synchronized via ISIS__ so they know what is the next hop as soon as they check the label**
 +
 +\\
 +
 +Configure explicit TE:
 +
 +  PE1
 +  management te
 +  mpls traffic-eng
 +  
 +  router traffic-engineering
 +     segment-routing
 +        policy endpoint 10.0.0.6 color 100
 +           name TO-PE2-EXPLICIT
 +           binding-sid 1000100
 +           path-group preference 100
 +              segment-list label-stack 900007 900008 900009 900010 900006
 +  
 +  route-map SET-COLOR-100 permit 10
 +     set extcommunity color 100
 +  
 +  router bgp 65001
 +     neighbor 10.0.0.6 route-map SET-COLOR-100 in
 +  
 +  show traffic-engineering segment-routing policy
 +  Endpoint 10.0.0.6 Color 100, Name: TO-PE2-EXPLICIT, Counters: not available
 +          Path group: State: active (for 00:02:05), modified: 00:02:05 ago
 +                  Protocol: Static
 +                  Originator: 0.0.0.0(AS0)
 +                  Preference: 100
 +                  IGP metric: 0 (static)
 +                  Binding SID: 1000100
 +                  Explicit null label policy: IPv6 (system default)
 +                  Segment List: State: Valid, ID: 1, Counters: not available
 +                  Protected: No, Reason: The top label is not protected
 +                          Label Stack: [900007 900008 900009 900010 900006], Weight: 1
 +                          Resolved Label Stack: [900008 900009 900010 900006], Next hop: 10.1.0.2, Interface: Ethernet1
 +  
 +  show traffic-engineering segment-routing policy
 +  show isis segment-routing prefix-segments
 +  show ip route vrf t1 172.16.1.0/24 detail
  
   <ios-xr commands>   <ios-xr commands>
network_stuff/arista/mpls.txt · Last modified: by jotasandoku

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