Routing

Hi, I have a question about RIPv1.The following is diagram.

I readvertised direct routes to RIP on R1
The following is ouput from R1 or R2

verifying the version of rip on R1 and R2, and both of them are version 1.
[edit logical-systems r1]
krenjt@Lab# run show rip neighbor logical-system r1
                         Source          Destination     Send   Receive   In
Neighbor          State  Address         Address         Mode   Mode     Met
--------          -----  -------         -----------     ----   -------  ---
em1.12               Up 131.108.6.1     131.108.6.3     v1     v1 only    1

[edit logical-systems r1]
krenjt@Lab# run show rip neighbor logical-system r2   
                         Source          Destination     Send   Receive   In
Neighbor          State  Address         Address         Mode   Mode     Met
--------          -----  -------         -----------     ----   -------  ---
em2.12               Up 131.108.6.2     131.108.6.3     v1     v1 only    1

outputing direct routes from R1:
[edit logical-systems r1]
krenjt@Lab# run show route protocol direct logical-system r1

inet.0: 9 destinations, 9 routes (9 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.1.1.0/24        *[Direct/0] 00:03:38
                    > via lo0.1
131.108.5.0/24     *[Direct/0] 00:03:38
                    > via em1.101
131.108.6.0/30     *[Direct/0] 00:03:38
                    > via em1.12
131.108.7.0/30     *[Direct/0] 00:03:38
                    > via em1.100

verifying that R1 advertised direct routes properly, and it works well.
[edit logical-systems r1]
krenjt@Lab# run show route advertising-protocol rip 131.108.6.1 logical-system r1

inet.0: 9 destinations, 9 routes (9 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.1.1.0/24        *[Direct/0] 00:04:30
                    > via lo0.1
131.108.5.0/24     *[Direct/0] 00:04:30
                    > via em1.101
131.108.7.0/30     *[Direct/0] 00:04:30
                    > via em1.100


showing rip routes on R2
[edit logical-systems r1]
krenjt@Lab# run show route protocol rip logical-system r2

inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.1.1.0/32        *[RIP/100] 00:07:06, metric 2, tag 0
                    > to 131.108.6.2 via em2.12
131.108.5.0/30     *[RIP/100] 00:07:10, metric 2, tag 0
                    > to 131.108.6.2 via em2.12
131.108.7.0/30     *[RIP/100] 00:07:10, metric 2, tag 0
                    > to 131.108.6.2 via em2.12
224.0.0.9/32       *[RIP/100] 00:07:10, metric 1
                      MultiRecv

why is 10.1.1.0/32 and it should be 10.1.1.0/24
why is 131.108.5.0/30 and it should be 131.108.5.0/24

thanks!

Hi,

The problem may be that RIP v1 is not announcing netmasks. Could You try with RIP v2 ?

Cheers,

Artur

RIPv1 doesn't send the subnet information to the neighbors.

If the recieved network ID fits the address classes (Class A, Class B, or Class C), the default class-based subnet mask is assumed.

If the network ID does not fit the address class, then:

If the recieved network ID and the interface on which it is received belong to same CLASSFULL address, the subnet mask of the interface on which it was received is assumed.

If it doesn't fit the above the network ID is assumed to be a host route with the subnet mask /32.

I never used RIPv1 anywhere, so this was interesting to me to check.

Created a simple netwrok running RIPv1.

R1 <==> R2   (WAN link 10.11.12.0/30)

Originated the following routes from R1
 0.0.0.0/0
 192.168.0.0/16
 10.11.12.0/24
 10.11.13.0/24
 10.20.13.0/24
 11.11.13.0/24

R2's routing table explains the above mentioned rule.

lab@LAB-960-001:R2> show route protocol rip
Aug 09 12:24:39

inet.0: 8 destinations, 9 routes (8 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

0.0.0.0/0          *[RIP/100] 00:14:59, metric 2, tag 0
                    > to 10.11.12.1 via xe-9/0/1.70
10.11.12.0/30       [RIP/100] 00:14:59, metric 2, tag 0
                    > to 10.11.12.1 via xe-9/0/1.70
10.11.13.0/30      *[RIP/100] 00:14:59, metric 2, tag 0
                    > to 10.11.12.1 via xe-9/0/1.70
10.20.13.0/30      *[RIP/100] 00:00:28, metric 2, tag 0
                    > to 10.11.12.1 via xe-9/0/1.70
11.11.13.0/32      *[RIP/100] 00:14:59, metric 2, tag 0
                    > to 10.11.12.1 via xe-9/0/1.70
192.168.0.0/24     *[RIP/100] 00:14:59, metric 2, tag 0
                    > to 10.11.12.1 via xe-9/0/1.70
224.0.0.9/32       *[RIP/100] 00:00:32, metric 1
                      MultiRecv

I hope this explains your question.

Thank you guys, thanks a lot.