RIP: Summary mask must be greater or equal to major net

RIP: Summary mask must be greater or equal to major net – Work Around

On April 1, 2009, in Cisco *STUFF*, RIP, Routing, by Divin John

rip_summaryaddress

R0

!
interface Loopback0
ip address 192.168.1.1 255.255.255.0
!
interface Loopback1
ip address 192.168.2.1 255.255.255.0
!
interface Loopback2
ip address 192.168.3.1 255.255.255.0
!
interface Loopback3
ip address 192.168.19.1 255.255.255.0
!
interface Loopback4
ip address 192.168.10.1 255.255.255.0
!
interface FastEthernet0/0
ip address 135.10.23.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
router rip
version 2
redistribute static
network 135.10.0.0
no auto-summary
!
ip classless
ip route 192.168.0.0 255.255.224.0 Null0
ip http server
ip pim bidir-enable
!

R1

!
interface FastEthernet0/0
ip address 135.10.23.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
router rip
version 2
network 135.10.0.0
no auto-summary
!

R1#sh ip route
Codes: C – connected, S – static, I – IGRP, R – RIP, M – mobile, B – BGP
D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF external type 1, E2 – OSPF external type 2, E – EGP
i – IS-IS, L1 – IS-IS level-1, L2 – IS-IS level-2, ia – IS-IS inter area
* – candidate default, U – per-user static route, o – ODR
P – periodic downloaded static route

Gateway of last resort is not set

135.10.0.0/24 is subnetted, 1 subnets
C 135.10.23.0 is directly connected, FastEthernet0/0
R 192.168.0.0/19 [120/1] via 135.10.23.1, 00:00:05, FastEthernet0/0

The “ip summary-address rip” interface command supports summarization only up to the class-ful network boundaries.

If you had 10.1.2.0/24 you could summarize this to any summary from /8 to /23, but a /7 summary would not work.

EIGRP does permit supernet summaries, including 0.0.0.0 0.0.0.0 to provide a default route for the neighbor on the interface the summary is configured on.

To solve this issue. You have to make a static route of the desired Summary address point it to Null Interface then redistribute static into RIP.!

Divin John

IT is my life. Although I'm primarily a network guy, every aspect of the online world entices me. From network design to intrusion analysis to writing code; I love to get into everything. Although this can become distracting, it has proven to be an invaluable attribute throughout my life. It is my belief that to truly understand data networks, becoming a jack of all trades is not only beneficial, but necessary. I am currently trying to get the CCIE Routing & Switching Certification!.

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