Re: EIGRP summary address problem

Hi Steve/Darby,

I am sure I am missing something really simple.
I was expecting to see 28.28.0.0/16 in the routing table of BB3. Note
that I was also experimenting with a floating summary route of 0.0.0.0
(which was seen in the routing table of BB3 o.k. - BB3#show ip route ei
D* 0.0.0.0/0 [90/284160] via 192.168.3.1, 00:00:10, Ethernet0)

R6:
interface GigabitEthernet0/0
 ip address 28.28.11.6 255.255.255.0
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/1.70
 encapsulation dot1Q 70
 ip address 192.168.3.1 255.255.255.0
 ip summary-address eigrp 100 28.28.0.0 255.255.0.0 5
!
router eigrp 28
 network 28.28.6.6 0.0.0.0
 network 28.28.11.0 0.0.0.255
 network 192.168.3.0
 no auto-summary
 eigrp router-id 28.28.6.6
!
router eigrp 100
 network 192.168.3.0
 no auto-summary
end

R6#show ip route
Gateway of last resort is not set
     172.16.0.0/24 is subnetted, 3 subnets
D 172.16.0.0
           [90/156160] via 192.168.3.254, 01:29:03, GigabitEthernet0/1.70
D 172.16.1.0
           [90/156160] via 192.168.3.254, 01:29:03, GigabitEthernet0/1.70
D 172.16.2.0
           [90/156160] via 192.168.3.254, 01:29:03, GigabitEthernet0/1.70
     28.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
D 28.28.7.7/32 [90/156160] via 28.28.11.7, 03:06:59,
GigabitEthernet0/0
C 28.28.6.6/32 is directly connected, Loopback0
D 28.28.4.4/32 [90/156160] via 28.28.11.4, 03:04:17,
GigabitEthernet0/0
D 28.28.3.3/32 [90/156160] via 28.28.11.3, 03:05:16,
GigabitEthernet0/0
C 28.28.11.0/24 is directly connected, GigabitEthernet0/0
C 192.168.2.0/24 is directly connected, GigabitEthernet0/1.50
C 192.168.3.0/24 is directly connected, GigabitEthernet0/1.70

BB3:
interface Loopback1
 ip address 172.16.0.1 255.255.255.0
!
interface Loopback2
 ip address 172.16.1.1 255.255.255.0
!
interface Loopback3
 ip address 172.16.2.1 255.255.255.0
!
interface Ethernet0
 ip address 192.168.3.254 255.255.255.0
!
router eigrp 100
 network 192.168.3.0
 network 0.0.0.0
 no auto-summary
end

BB3#show ip route
Gateway of last resort is not set
     172.16.0.0/24 is subnetted, 3 subnets
C 172.16.0.0 is directly connected, Loopback1
C 172.16.1.0 is directly connected, Loopback2
C 172.16.2.0 is directly connected, Loopback3
C 192.168.3.0/24 is directly connected, Ethernet0

What is preventing the summary aggregate address from being sent?

regards Andy

Steve Lyons wrote:
> Andy,
> Send your configuration to the group and the sh ip route output. I
> would like to see what is configured.
>
> Steve Lyons
>
> On Sun, Sep 13, 2009 at 11:13 AM, Andy Reid <ccie_at_reid.it
> <mailto:ccie_at_reid.it>> wrote:
>
> Hi all,
>
> I am experiencing an unexpected problem when configuring an EIGRP
> summary address on the interface of R6 which is connected to BB3.
>
> The problem is that any summary address except for 0.0.0.0 0.0.0.0
> is not sent by R6 to BB3. I have a couple of /32 loopback
> addresses in the routing table of R6 and I am trying to advertise
> them as a summary address /16. I have even tried adding a default
> route for the /16 network to null0 on R6, yet it is still not
> advertised to BB3.
>
> Are there any caveats to using a summary-address on an interface
> for EIGRP? and why does a default summary route work when all
> others don't?
>
> Yours frustrated, Andy
>
>
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Received on Sun Sep 13 2009 - 23:29:07 ART