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RIPv2 Routing Summarization issue

Matthew Knott
Level 1
Level 1

‎01-22-2017 09:37 PM - edited ‎03-08-2019 09:01 AM

Hi All, 

Hoping you can help me with this.

I have a site that is using RIPv2 to advertise its routes using the following settings on a WS-C3650-24TS running 03.03.04SE  :-

router rip
 version 2
 redistribute connected
 passive-interface default
 network 10.0.0.0
 neighbor 10.204.0.13
 distribute-list 14 out Vlan100
 no auto-summary

access-list 14 remark PREVENT ANNOUNCING EXISTING SUBNET
access-list 14 permit 10.204.0.24 0.0.0.7
access-list 14 permit 10.197.0.0 0.0.15.255
access-list 14 permit 10.20.0.0 0.0.255.255
access-list 14 permit 10.21.0.0 0.0.255.255
access-list 14 deny   any

The Configuration on the Interfaces is as follows.

!
interface Vlan99
 ip address 10.197.0.1 255.255.255.0
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan100
 ip address 10.204.0.9 255.255.255.248
!
interface Vlan110
 ip address 10.197.2.1 255.255.255.128
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan115
 ip address 10.197.2.129 255.255.255.128
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan120
 ip address 10.197.3.1 255.255.255.0
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan121
 ip address 10.197.4.1 255.255.255.0
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan200
 ip address 10.197.5.1 255.255.255.0
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0

!

interface Vlan400
 ip address 10.197.7.1 255.255.255.0
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan410
 ip address 10.197.8.1 255.255.255.192
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan411
 ip address 10.197.8.65 255.255.255.192
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan500
 ip address 10.197.9.1 255.255.255.192
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan501
 ip address 10.197.9.65 255.255.255.192
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan510
 ip address 10.197.10.1 255.255.255.0
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan520
 ip address 10.197.11.1 255.255.255.128
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan521
 ip address 10.197.11.129 255.255.255.128
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan600
 ip address 10.197.12.1 255.255.255.128
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan601
 ip address 10.197.12.129 255.255.255.128
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0
!
interface Vlan610
 ip address 10.197.13.1 255.255.255.0
 ip helper-address 10.20.4.1
 no ip split-horizon
 ip summary-address rip 10.197.0.0 255.255.240.0

As you can see all the subnets that are advertised are withing the 10.197.0.0 255.255.240.0  Mask

The Output of show ip rip database shows

10.197.0.0/20    int-summary
10.197.0.0/24    directly connected, Vlan99
10.197.2.0/25    directly connected, Vlan110
10.197.2.128/25    directly connected, Vlan115
10.197.3.0/24    directly connected, Vlan120
10.197.4.0/24    directly connected, Vlan121
10.197.5.0/24    directly connected, Vlan200
10.197.6.0/24    directly connected, Vlan20
10.197.7.0/24    directly connected, Vlan400
10.197.8.0/26    directly connected, Vlan410
10.197.8.64/26    directly connected, Vlan411
10.197.9.0/26    directly connected, Vlan500
10.197.9.64/26    directly connected, Vlan501
10.197.10.0/24    directly connected, Vlan510
10.197.11.0/25    directly connected, Vlan520
10.197.11.128/25    directly connected, Vlan521
10.197.12.0/25    directly connected, Vlan600
10.197.12.128/25    directly connected, Vlan601
10.197.13.0/24    directly connected, Vlan610

And the output of show ip protocols is :-

*** IP Routing is NSF aware ***

Routing Protocol is "rip"
  Outgoing update filter list for all interfaces is not set
    Vlan100 filtered by 14 (per-user), default is not set
  Incoming update filter list for all interfaces is not set
  Sending updates every 30 seconds, next due in 28 seconds
  Invalid after 180 seconds, hold down 180, flushed after 240
  Redistributing: connected, rip
  Neighbor(s):
    10.204.0.13
  Default version control: send version 2, receive version 2
  Automatic network summarization is not in effect
  Address Summarization:
    10.197.0.0/20 for Vlan110
    10.197.0.0/20 for Vlan99
    10.197.0.0/20 for Vlan115
    10.197.0.0/20 for Vlan120
    10.197.0.0/20 for Vlan121
    10.197.0.0/20 for Vlan200
    10.197.0.0/20 for Vlan400
    10.197.0.0/20 for Vlan410
    10.197.0.0/20 for Vlan411
    10.197.0.0/20 for Vlan20
    10.197.0.0/20 for Vlan500
    10.197.0.0/20 for Vlan501
    10.197.0.0/20 for Vlan510
    10.197.0.0/20 for Vlan520
    10.197.0.0/20 for Vlan521
    10.197.0.0/20 for Vlan600
    10.197.0.0/20 for Vlan601
    10.197.0.0/20 for Vlan610
  Maximum path: 4
  Routing for Networks:
    10.0.0.0
  Passive Interface(s):
    Vlan1
    Vlan20
    Vlan99

    Vlan101
    Vlan110
    Vlan115
    Vlan120
    Vlan121
    Vlan200
    Vlan300
    Vlan400
    Vlan410
    Vlan411
    Vlan500
    Vlan501
    Vlan510
    Vlan520
    Vlan521
    Vlan600
    Vlan601
    Vlan610
  Routing Information Sources:
    Gateway         Distance      Last Update
    10.204.0.13          120      00:00:07
  Distance: (default is 120)

So as far as I can see it should only be announcing 10.197.0.0/20 to the Router.

But, looking at the router connected to this switch, I see the Following :-

#show ip route | inc 10.197

R       10.197.0.0/24 [120/2] via 10.204.0.77, 00:00:00, Vlan101

R       10.197.2.0/25 [120/2] via 10.204.0.77, 00:00:20, Vlan101

R       10.197.2.128/25 [120/2] via 10.204.0.77, 00:00:20, Vlan101

R       10.197.3.0/24 [120/2] via 10.204.0.77, 00:00:25, Vlan101

R       10.197.4.0/24 [120/2] via 10.204.0.77, 00:00:16, Vlan101

R       10.197.5.0/24 [120/2] via 10.204.0.77, 00:00:06, Vlan101

R       10.197.6.0/24 [120/2] via 10.204.0.77, 00:00:20, Vlan101

R       10.197.7.0/24 [120/2] via 10.204.0.77, 00:00:08, Vlan101

R       10.197.8.0/26 [120/2] via 10.204.0.77, 00:00:24, Vlan101

R       10.197.8.64/26 [120/2] via 10.204.0.77, 00:00:24, Vlan101

R       10.197.9.0/26 [120/2] via 10.204.0.77, 00:00:00, Vlan101

R       10.197.9.64/26 [120/2] via 10.204.0.77, 00:00:00, Vlan101

R       10.197.12.128/25 [120/2] via 10.204.0.77, 00:00:04, Vlan101
R       10.197.11.128/25 [120/2] via 10.204.0.77, 00:00:04, Vlan101

R       10.197.13.0/24 [120/2] via 10.204.0.77, 00:00:17, Vlan101
R       10.197.12.0/25 [120/2] via 10.204.0.77, 00:00:17, Vlan101
R       10.197.11.0/25 [120/2] via 10.204.0.77, 00:00:17, Vlan101
R       10.197.10.0/24 [120/2] via 10.204.0.77, 00:00:17, Vlan101

I'm guessing I've done something really stupid, Anyone got any idea's as to what I've done??

Thanks

Matthew

Labels:
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1 Reply 1

Francesco Molino
VIP Alumni
VIP Alumni

‎01-24-2017 05:36 AM

Hi

Could you tell us about your neighbour peer? It seems that the neighbouring is done through vlan 101 (what the output shows) however on your rip configuration you just allowed neighbour 10.204.0.13 that corresponds to vlan 100 (on your config output).

Which one is correct?

Anyway, on this vlan 100 you didn't set the ip summary rip command.

Thanks

PS: Please don't forget to rate and mark as correct answer if this answered your question


Thanks
Francesco
PS: Please don't forget to rate and select as validated answer if this answered your question
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