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network_stuff:arista:mpls [2022/12/27 17:32] – jotasandokunetwork_stuff:arista:mpls [2025/04/13 13:36] (current) – jotasandoku
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 TODO TODO
 ---- ----
-MPLS SEGMENT ROUTING NOTES (SR-MPLS NOTES)+MPLS SEGMENT ROUTING NOTES (SRv6) 
 +\\ 
 +think of SRv6–using IPv6 addresses as segment IDs, and breaking the least significant /64 to create microsids for service differentiation
 \\ \\
 Is mostly MPLS but: Is mostly MPLS but:
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   * This null label is always 'sent' by the PE as signalling to the PHP.   * This null label is always 'sent' by the PE as signalling to the PHP.
     * implicit null is no signalling and letting the PHP do its thing and send the mpls label as an IP packet (no labels) towards the PE     * implicit null is no signalling and letting the PHP do its thing and send the mpls label as an IP packet (no labels) towards the PE
-    * explicit null is the PHP sending the mpls packet with the last label as a 'dummy' one (value 0). The advantage is that EXP and QoS values are preserved.+    * explicit null is the PHP sending the mpls packet with the last label as a 'dummy' one (value 0(2 in IPv6)). The advantage is that EXP and QoS values are preserved. 
 + 
 + 
 +---- 
 + 
 +SHOW COMMANDS: 
 +\\ 
 +  show ip bgp vrf red 
 +  show ip route vrf red | begin Gateway 
 +  show mpls lfib route    # arista only labels for lo. You'll only see transport labels here 
 +  show bgp vpn-ipv4 172.16.0.0/24 detail # this is for the vpnv4 of the customer prefix 172 
 +  ! 
 +  pe1#show bgp vpn-ipv4 172.16.2.0/24 detail 
 +  BGP routing table information for VRF default 
 +  Router identifier 10.0.0.1, local AS number 65000 
 +  BGP routing table entry for IPv4 prefix 172.16.2.0/24, Route Distinguisher: 65000:2 
 +   Paths: 1 available 
 +    Local 
 +      10.0.0.2 from 10.0.0.2 (10.0.0.2) 
 +        Origin IGP, metric -, localpref 100, weight 0, valid, internal, best 
 +        Extended Community: Route-Target-AS:65000:2 
 +        Remote MPLS label: 100001    <<< the vpnv4 label for 172.16.2.0/24 
 +  !     
 +       
 +  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 bindings     # luk lesson 2.3
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