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[Junos] IP address in RRO list is different from IP addresses in predetermined LSP path

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Article ID: KB32204 KB Last Updated: 21 Oct 2020Version: 1.0
Summary:

In some cases, the IP address in RECORD_ROUTE object (RRO) list is not the same as the IP addresses in the predetermined EXPLICIT_ROUTE object (ERO) MPLS label switched path (LSP).

Symptoms:

In the example below, predetermined EXPLICIT_ROUTE object (ERO) 3.3.3.3 is not in the list of RRO.

user@r1_re0# show protocols mpls

label-switched-path r1-r4 {
    from 1.1.1.1;
    to 4.4.4.4;
    no-cspf;
    priority 5 5;
    record;
    primary r1-r3-002-r4;
}
path r1-r3-002-r4 {
    1.2.0.2;
    3.3.3.3;   <-- loopback of R3
    3.4.2.2;
}
interface all;
 
user@r1_re0# run show mpls lsp name r1-r4 extensive        
Ingress LSP: 1 sessions
 
4.4.4.4
  From: 1.1.1.1, State: Up, ActiveRoute: 0, LSPname: r1-r4
  ActivePath: r1-r3-002-r4 (primary)
  LSPtype: Static Configured, Penultimate hop popping
  LoadBalance: Random
  Encoding type: Packet, Switching type: Packet, GPID: IPv4
 *Primary   r1-r3-002-r4     State: Up
    Priorities: 5 5
    SmartOptimizeTimer: 180
    Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt 20=Node-ID):
          1.2.0.2 2.3.1.2 3.4.2.2
   74 Sep 21 22:08:10.411 Up
……
 
Solution:

According to tools.ietf.org, RFC3209 specifies any network-reachable interface address is allowed here, except certain loopback addresses. 

If there are multiple addresses to choose from on an intermediate LSR, the decision is a local matter.  However, it is recommended that the same address is to be chosen consistently.

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