route summarization 20.0.0.0/8 or /14?

James777

Hi all,

one of Chris Bryant's videos has the following route summarization example:
R2 has loopback21 (20.1.1.1/24) and loopback22 (20.2.1.1/24)


and RIP summarizes the two addrs as 20.0.0.0/8


video:https://www.udemy.com/ccna-on-demand-video-boot-camp/learn/v4/t/lecture/5816672?start=0but

But from my understanding, these 2 addrs should be summarized as 20.0.0.0/14, since from the binaries:
00010100.00000001.00000001.00000001 (20.1.1.1)
00010100.00000010.00000001.00000001 (20.2.1.1)

which one is correct?

Thanks in advance.

Magic Johnson

/8 is correct, RIP is classful.

leonlimsg

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.

dppagc

Use router rip, no auto-summary.
TS,
Class A will be summarised to /8, Class B /16, Class C /24 for classful routing protocol.