RIPv1 Summarisation

nezzy456nezzy456 Posts: 53Users Awaiting Email Confirmation ■■□□□□□□□□
Hi,

I was just wondering about summarisation.
If RIPv1 is summarising what happens to variable metrics?

If the router which is sending the summary knows of 2 networks which all are different hops away 1, 2.

172.30.1.0 172.30.2.0 192.168.1.0
Router
Router
Router2
Router 1
Boundary

What will he send to Router 1?
I guess he will summarise to 172.30.0.0 but what metric? 1 or 2?

Cheers

Comments

  • phoeneousphoeneous Go ping yourself... Posts: 2,331Member ■■■■■■■□□□
    nezzy456 wrote: »
    Hi,

    I was just wondering about summarisation.
    If RIPv1 is summarising what happens to variable metrics?

    If the router which is sending the summary knows of 2 networks which all are different hops away 1, 2.

    172.30.1.0 172.30.2.0 192.168.1.0
    Router
    Router
    Router2
    Router 1
    Boundary

    What will he send to Router 1?
    I guess he will summarise to 172.30.0.0 but what metric? 1 or 2?

    Cheers

    See attached screenshot from PT

    From left to right, r1 - r2 - r3 - r4

    r1 sh ip route
    172.30.0.0/24 is subnetted, 2 subnets
    C 172.30.1.0 is directly connected, Serial0/0/0
    R 172.30.2.0 [120/1] via 172.30.1.2, 00:00:00, Serial0/0/0
    R 192.168.1.0/24 [120/2] via 172.30.1.2, 00:00:00, Serial0/0/0

    r2 sh ip route
    C 172.30.1.0 is directly connected, Serial0/0/0
    C 172.30.2.0 is directly connected, Serial0/1/0
    R 192.168.1.0/24 [120/1] via 172.30.2.2, 00:00:25, Serial0/1/0

    r3 sh ip route
    172.30.0.0/24 is subnetted, 2 subnets
    R 172.30.1.0 [120/1] via 172.30.2.1, 00:00:17, Serial0/0/0
    C 172.30.2.0 is directly connected, Serial0/0/0
    C 192.168.1.0/24 is directly connected, Serial0/1/0

    r4 sh ip route
    R 172.30.0.0/16 [120/1] via 192.168.1.1, 00:00:02, Serial0/0/0
    C 192.168.1.0/24 is directly connected, Serial0/0/0




    r1#sh ip pro
    Routing Protocol is "rip"
    Sending updates every 30 seconds, next due in 21 seconds
    Invalid after 180 seconds, hold down 180, flushed after 240
    Outgoing update filter list for all interfaces is not set
    Incoming update filter list for all interfaces is not set
    Redistributing: rip
    Default version control: send version 1, receive any version
    Interface Send Recv Triggered RIP Key-chain
    Serial0/0/0 1 2 1
    Automatic network summarization is in effect
    Maximum path: 4
    Routing for Networks:
    172.30.0.0
    Passive Interface(s):
    Routing Information Sources:
    Gateway Distance Last Update
    172.30.1.2 120 00:00:05
    Distance: (default is 120)



    r2#sh ip pro
    Routing Protocol is "rip"
    Sending updates every 30 seconds, next due in 2 seconds
    Invalid after 180 seconds, hold down 180, flushed after 240
    Outgoing update filter list for all interfaces is not set
    Incoming update filter list for all interfaces is not set
    Redistributing: rip
    Default version control: send version 1, receive any version
    Interface Send Recv Triggered RIP Key-chain
    Serial0/0/0 1 2 1
    Serial0/1/0 1 2 1
    Automatic network summarization is in effect
    Maximum path: 4
    Routing for Networks:
    172.30.0.0
    Passive Interface(s):
    Routing Information Sources:
    Gateway Distance Last Update
    172.30.2.2 120 00:00:04
    Distance: (default is 120)



    r3#sh ip pro
    Routing Protocol is "rip"
    Sending updates every 30 seconds, next due in 5 seconds
    Invalid after 180 seconds, hold down 180, flushed after 240
    Outgoing update filter list for all interfaces is not set
    Incoming update filter list for all interfaces is not set
    Redistributing: rip
    Default version control: send version 1, receive any version
    Interface Send Recv Triggered RIP Key-chain
    Serial0/0/0 1 2 1
    Serial0/1/0 1 2 1
    Automatic network summarization is in effect
    Maximum path: 4
    Routing for Networks:
    172.30.0.0
    192.168.1.0
    Passive Interface(s):
    Routing Information Sources:
    Gateway Distance Last Update
    172.30.2.1 120 00:00:15
    Distance: (default is 120)



    r4#sh ip pro
    Routing Protocol is "rip"
    Sending updates every 30 seconds, next due in 28 seconds
    Invalid after 180 seconds, hold down 180, flushed after 240
    Outgoing update filter list for all interfaces is not set
    Incoming update filter list for all interfaces is not set
    Redistributing: rip
    Default version control: send version 1, receive any version
    Interface Send Recv Triggered RIP Key-chain
    Serial0/0/0 1 2 1
    Automatic network summarization is in effect
    Maximum path: 4
    Routing for Networks:
    192.168.1.0
    Passive Interface(s):
    Routing Information Sources:
    Gateway Distance Last Update
    192.168.1.1 120 00:00:07
    Distance: (default is 120)
  • NeekoNeeko Posts: 170Member
    I struggled to understand what you were even asking, man thats one badly articulated question icon_silent.gif
  • nezzy456nezzy456 Posts: 53Users Awaiting Email Confirmation ■■□□□□□□□□
    Thanks phoeneous

    That has helped :)
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