Description

The customer reported that the LDP routes are missing for the nodes that enabled for both SR and LDP after configuring
"set protocols ldp sr-mapping-client -mapping-client"

Symptoms

The sr-mapping-client configuration knob under protocol LDP is used on the node located on the border of LDP and SR networks usually use during migration from LDP to SR 

Solution

Based on the lab testing it seems the reported behavior is expected, As per the testing in Lab after adding this knob we have those observations :
 
  1. The route for LDP for  the nodes enabled for LDP/SR in inet.3 is removed
  2. Allocate a new LDP label for your SR nodes and advertise it to the LDP sessions  
  3. New entry for the transit traffic in mpls.0 to swap LDP -> SR labels  
  4. If the SR label is not reachable for any reason the LDP route reappears in inet.3 ( and the transit mpls.0 LDP -> SR entry disappears)


 

Modification History

2024-09-05 : Article Created