route summarization or /14?

James777James777 Posts: 20Member ■□□□□□□□□□
Hi all,

one of Chris Bryant's videos has the following route summarization example:
R2 has loopback21 ( and loopback22 (

and RIP summarizes the two addrs as


But from my understanding, these 2 addrs should be summarized as, since from the binaries:
00010100.00000001.00000001.00000001 (
00010100.00000010.00000001.00000001 (

which one is correct?

Thanks in advance.


  • Magic JohnsonMagic Johnson Posts: 414Member
    /8 is correct, RIP is classful.
  • leonlimsgleonlimsg Posts: 10Member ■□□□□□□□□□
    RIP is a classful routing protocol. It will summarize the address to its classful boundary.

    RIPv2 can be classless but it is not enabled by default in Cisco routers.
  • dppagcdppagc Posts: 293Member
    Use router rip, no auto-summary.
    Class A will be summarised to /8, Class B /16, Class C /24 for classful routing protocol.
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