Hello,

Could someone help me to understand a strange behavior with RIP?

I have four equipments connected directly in this way:

A --- B
|  \  /  |
|   / \  |
C --- D

The interfaces that connect B to D is G0/22, in B, and G2/1 in D. I have
done a RIP debug in B and I see:

Oct  6 12:03:41: RIP: sending v2 update to 224.0.0.9 via GigabitEthernet0/22
(13.109.48.13)
Oct  6 12:03:41: RIP: build update entries
Oct  6 12:03:41:        0.0.0.0/0 via 0.0.0.0, metric 3, tag 0
Oct  6 12:03:41:        6.109.48.0/20 via 13.109.48.14, metric 1, tag 0
Oct  6 12:03:41:        9.109.48.12/32 via 0.0.0.0, metric 1, tag 0
Oct  6 12:03:41:        13.109.48.8/30 via 0.0.0.0, metric 1, tag 0
Oct  6 12:03:41:        13.109.49.0/26 via 13.109.48.14, metric 1, tag 0
Oct  6 12:03:41:        15.109.48.0/20 via 13.109.48.14, metric 1, tag 0
Oct  6 12:03:41:        20.1.50.0/24 via 13.109.48.14, metric 1, tag 0
Oct  6 12:03:41:        21.109.48.0/20 via 13.109.48.14, metric 1, tag 0
Oct  6 12:03:41:        22.109.48.0/20 via 13.109.48.14, metric 1, tag 0
Oct  6 12:03:41:        25.109.48.0/20 via 13.109.48.14, metric 1, tag 0
Oct  6 12:03:41:        172.24.168.0/21 via 0.0.0.0, metric 1, tag 0

But in D I see:

Oct  6 12:03:41: RIP: received v2 update from 13.109.48.13 on
GigabitEthernet2/1
Oct  6 12:03:41:      0.0.0.0/0 via 0.0.0.0 in 4 hops
Oct  6 12:03:41:      9.109.48.12/32 via 0.0.0.0 in 2 hops
Oct  6 12:03:41:      13.109.48.8/30 via 0.0.0.0 in 2 hops
Oct  6 12:03:41:      172.24.168.0/21 via 0.0.0.0 in 2 hops

D#
 router rip
  version 2
  timers basic 30 70 70 90
  passive-interface default
  no passive-interface Vlan100
  offset-list 20 in 1 GigabitEthernet2/1
  offset-list 20 in 2 GigabitEthernet2/2
  offset-list 20 in 3 Vlan100
  network 13.0.0.0
  no auto-summary

 access-list 20 permit any

interface GigabitEthernet2/1
 ip address 13.109.48.14 255.255.255.252

D#sh ip int brief

GigabitEthernet2/1     13.109.48.14    YES TFTP   up
up
GigabitEthernet2/2     13.109.48.6     YES TFTP   up
up
Vlan2                  22.109.48.3     YES TFTP   up
up
Vlan5                  6.109.48.3      YES TFTP   up
up
Vlan13                 13.109.48.227   YES TFTP   up
up
Vlan14                 13.109.48.243   YES TFTP   up
up
Vlan15                 13.109.49.3     YES TFTP   up
up
Vlan21                 15.109.48.3     YES TFTP   up
up
Vlan31                 25.109.48.3     YES TFTP   up
up
Vlan41                 21.109.48.3     YES TFTP   up
up
Vlan100                13.109.48.18    YES TFTP   up
up
Loopback0              9.109.48.14     YES TFTP   up                    up

I'm running OSPF as well in the square but I'm afraid, it doesn't care with
this issue.

Does anybody knows could it be happening?

Thanks,
Cesar.
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