Routing

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  • 1.  Question on Multiple IP addresses on the Same Loopback Sub-interface

     
    Posted 07-30-2022 03:36

    Hi.

     

    Why would an Enterprise router's loopback interface ever need multiple IP addresses on a single sub-interface as shown below?

     

    interfaces {

       loopback {

          family inet {

             address 172.16.1.1/32 {

                primary;

             }

             address 172.16.2.1/32;

             address 172.16.3.1/32;

             address 172.16.4.1/32;

          }

       }

    }

     

    Thanks,

    Deepak

     


    Juniper Business Use Only



  • 2.  RE: Question on Multiple IP addresses on the Same Loopback Sub-interface

    Posted 07-30-2022 12:49
    I've only seen this in deployments of BNG for the gateway address of the subnets being managed. 

    I doubt that use case is found in the enterprise.

    ------------------------------
    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
    http://puluka.com/home
    ------------------------------



  • 3.  RE: Question on Multiple IP addresses on the Same Loopback Sub-interface

    Posted 07-30-2022 13:16
    Multicast uses, such as MSDP and/or Anycast RP come to mind.