03-26-2010 10:06 PM - edited 03-04-2019 07:56 AM
Hello,
I have 3 routers connected like this: r1 -> r2 -> r3
EIGRP adjacency is estabalished between r1, r2 and r2, r3.
r1 is originating default route through summary address command and I do not want r3 to receive the default route. So, I configured no default-information originate out on r2. But still R3 is getting default route via r2.
Am I missing anything here?
Regards
Sourabh
Solved! Go to Solution.
03-28-2010 07:16 AM
Hi Sourabh,
You are setting default-network at R1, and this route is received from R2; R1 will not advertise the same route back to R2.
To test this default-network behavior, you can do
on R1
int lo0
ip add 1.1.1.1 255.0.0.0
ip default-network 1.0.0.0
router eigrp x
net 0.0.0.0
and you should see * mark for connected route 1.0.0.0/8 on R1, and * mark for eigrp route 1.0.0.0/8 on R2.
Now configure "no default-information out" on R1 to remove the default-network bit, and clear ip eigrp nei. After re-converge, R2 will not see * mark for eigrp route 1.0.0.0/8. You can achieve the same by doing "no default-information in" on R2. Remember every time you change the "default-information in/out" you need to do "clear ip eigrp nei" to make it work.
BTW, looks like you are using 15.0 code, not SRC code?
HTH,
Lei Tian
03-27-2010 03:48 AM
Hello Sourabh,
so you have R1-R2-R3
R1 generates a default route 0.0.0.0/0 and you would like R3 to not receive it.
The command that you have given in R2 attempts to avoid R2 to locally generate a default route but does not block propagation of the default route received by R1 to R3.
you should use a distribute-list for this to perform route filtering outbound on interface to R3.
on recent IOS release like 12.4T the distribute-list command could invoke a route-map
Hope to help
Giuseppe
03-27-2010 04:51 AM
Hello Giuseppe,
So do you mean configuring no default-information out command will not allow router to generate default router.
I tried configuring this command on R1 and R1 can still generate default route and pass it to R2 and R3. Also in what scenario no default-information in command will be used then?
Regards
Sourabh
03-27-2010 05:48 AM
Hi Sourabh,
Are you using command "default information-originate" or "default-information in/ou" under eigrp process? Which code are you testing?
HTH,
Lei Tian
03-27-2010 11:57 AM
Hello Lei Tian,
I'm using 'no default-information out' under eigrp process and testing it with 12.2(33)SRC1.
Regards
Sourabh
03-27-2010 12:57 PM
Hi Sourabh,
This command is not used to advertise or block 0.0.0.0 route.
It is used when you have "ip default-network" configured; configure "default-information in" can remove the received route with candidate default-network bit, and "default-information out" can remove the candidate default-network bit when advertise out the route.
HTH,
Lei Tian
03-27-2010 11:21 PM
Hello Lei Tian,
Thanks for the clarification.
I have configured ip default-network 150.1.0.0 command on R1 and it sets the default route via R2.
R1(config-router)#do sh ip route
Gateway of last resort is 150.1.12.2 to network 150.1.0.0
S* 0.0.0.0/0 [90/30720] via 150.1.12.2, FastEthernet0/0
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 1.1.1.0/24 is directly connected, Loopback0
L 1.1.1.1/32 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
D 2.2.2.0 [90/156160] via 150.1.12.2, 00:01:35, FastEthernet0/0
4.0.0.0/24 is subnetted, 1 subnets
D EX 4.4.4.0 [170/2560002816] via 150.1.12.2, 00:01:28, FastEthernet0/0
* 150.1.0.0/16 is variably subnetted, 3 subnets, 3 masks
D* 150.1.0.0/16 [90/30720] via 150.1.12.2, 00:01:35, FastEthernet0/0
C 150.1.12.0/24 is directly connected, FastEthernet0/0
L 150.1.12.1/32 is directly connected, FastEthernet0/0
Now, if I configure 'no default-information in' on R1 OR 'no default-information out' on R2, the candidate network bit will be removed hence I should not see default route on R1. But even after doing this, I see default route present on R1.
Am I still missing anything here?
Regards
Sourabh
03-28-2010 07:16 AM
Hi Sourabh,
You are setting default-network at R1, and this route is received from R2; R1 will not advertise the same route back to R2.
To test this default-network behavior, you can do
on R1
int lo0
ip add 1.1.1.1 255.0.0.0
ip default-network 1.0.0.0
router eigrp x
net 0.0.0.0
and you should see * mark for connected route 1.0.0.0/8 on R1, and * mark for eigrp route 1.0.0.0/8 on R2.
Now configure "no default-information out" on R1 to remove the default-network bit, and clear ip eigrp nei. After re-converge, R2 will not see * mark for eigrp route 1.0.0.0/8. You can achieve the same by doing "no default-information in" on R2. Remember every time you change the "default-information in/out" you need to do "clear ip eigrp nei" to make it work.
BTW, looks like you are using 15.0 code, not SRC code?
HTH,
Lei Tian
03-28-2010 11:54 AM
Hello Lei Tian,
Thanks for the help, its working now.
I'm using SRC1 an not 15.0 code.
R1#sh ip route
Codes: L - local, C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, 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, + - replicated route
Gateway of last resort is not set
* 1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C* 1.0.0.0/8 is directly connected, Loopback0
L 1.1.1.1/32 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
D 2.2.2.0 [90/156160] via 150.1.12.2, 00:00:42, FastEthernet0/0
4.0.0.0/24 is subnetted, 1 subnets
D EX 4.4.4.0 [170/2560002816] via 150.1.12.2, 00:00:39, FastEthernet0/0
150.1.0.0/16 is variably subnetted, 3 subnets, 2 masks
C 150.1.12.0/24 is directly connected, FastEthernet0/0
L 150.1.12.1/32 is directly connected, FastEthernet0/0
D EX 150.1.24.0/24
[170/2560002816] via 150.1.12.2, 00:00:42, FastEthernet0/0
R1#sh ver | incl IOS
Cisco IOS Software, 7200 Software (C7200-ADVIPSERVICESK9-M), Version 12.2(33)SRC1, RE
LEASE SOFTWARE (fc1)
Regards
Sourabh
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