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--- network_stuff:arista:mpls [2026/03/14 21:02] – jotasandoku
+++ network_stuff:arista:mpls [2026/03/15 00:06] (current) – jotasandoku
@@ Line 123: / Line 123: @@
   traceroute mpls ldp ip 10.0.0.1/32    # this shows the swapping of the transport label
-  show mpls ldp neighbord    # luk lesson 2.3
+  show mpls ldp neighbor    # luk lesson 2.3
   show mpls ldp bindings     # luk lesson 2.3
@@ Line 129: / Line 129: @@
 ----
-###MPLS SEGMENT ROUTING - SR-MPLS###
+===MPLS SEGMENT ROUTING - SR-MPLS===
+== 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**
+\\
+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>
@@ Line 135: / Line 177: @@
   show segment-routing traffic-eng  policy summary
   show source-routing sr-te policy color 100 endpoint <IP> detail
-show segment-routing traffic-eng  policy endpoint ipv4
+  show segment-routing traffic-eng  policy endpoint ipv4

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