11-26-2013 08:16 AM - edited 03-07-2019 04:47 PM
I have 3750e and 6513 that is using EIGRP routing and setting default route to another switch, instead of firewall
How do i find out where these two switches are getting the EIGRP route from
Here is what is on both switches
D*EX 0.0.0.0/0 [170/3072] via 172.16.0.X, 7w0d, Vlan2?
Here from 3750e switch
sh ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS()
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
2 172.16.0.A Vl2? 11 08:49:34 7 200 0 4138
1 172.16.0.B Vl2? 12 08:49:34 2 200 0 5036
0 172.16.0.C Vl2? 12 1w4d 5 200 0 409
4 172.16.0.D Vl2? 14 8w4d 9 200 0 5311
5 172.16.0.X Vl2? 10 8w4d 8 200 0 2181
3 172.16.0.E Vl2? 11 8w4d 10 200 0 163686
Here from 6513 switch
sh ip eigrp neighbors
IP-EIGRP neighbors for process 500
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
3 172.16.0.A Vl2? 12 10:58:02 4 200 0 4138
2 172.16.0.B Vl2? 11 10:58:02 2 200 0 5036
0 172.16.0.C Vl2? 14 1w4d 2 200 0 391
4 172.16.0.D Vl2? 11 8w4d 9 200 0 5302
5 172.16.0.X Vl2? 13 8w4d 6 200 0 2172
1 172.16.0.F Vl2? 12 8w4d 6 200 0 2051
Solved! Go to Solution.
11-26-2013 09:08 AM
Hi Adam,
What about:
Router#sh ip eigrp topology 0.0.0.0
(Switch)
There should be Originating router field, that marks the router which injected that route into the EIGRP.
Example topology:
R1-s1/0----------s1/0-R2-s1/1---------s1/1-R3
R1 s1/0 12.0.0.1
R2 s1/0 12.0.0.2
R2 s1/1 23.0.0.2
R3 s1/1 23.0.0.3
R3 is injecting default route.
R1's output:
R1#sh ip eigrp topology 0.0.0.0
IP-EIGRP (AS 1): Topology entry for 0.0.0.0/0
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2809856
Routing Descriptor Blocks:
12.0.0.2 (Serial1/0), from 12.0.0.2, Send flag is 0x0
Composite metric is (2809856/2297856), Route is External
Vector metric:
Minimum bandwidth is 1544 Kbit
Total delay is 45000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 2
External data:
Originating router is 23.0.0.3
AS number of route is 0
External protocol is Static, external metric is 0
Administrator tag is 0 (0x00000000)
Exterior flag is set
You should be able to identify the delinquent that way.
Best regards,
Jan
11-26-2013 09:08 AM
Hi Adam,
What about:
Router#sh ip eigrp topology 0.0.0.0
(Switch)
There should be Originating router field, that marks the router which injected that route into the EIGRP.
Example topology:
R1-s1/0----------s1/0-R2-s1/1---------s1/1-R3
R1 s1/0 12.0.0.1
R2 s1/0 12.0.0.2
R2 s1/1 23.0.0.2
R3 s1/1 23.0.0.3
R3 is injecting default route.
R1's output:
R1#sh ip eigrp topology 0.0.0.0
IP-EIGRP (AS 1): Topology entry for 0.0.0.0/0
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2809856
Routing Descriptor Blocks:
12.0.0.2 (Serial1/0), from 12.0.0.2, Send flag is 0x0
Composite metric is (2809856/2297856), Route is External
Vector metric:
Minimum bandwidth is 1544 Kbit
Total delay is 45000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 2
External data:
Originating router is 23.0.0.3
AS number of route is 0
External protocol is Static, external metric is 0
Administrator tag is 0 (0x00000000)
Exterior flag is set
You should be able to identify the delinquent that way.
Best regards,
Jan
11-26-2013 01:22 PM
Wow I wish I would have check this earlier.
Ok, from that command I found out where that route is coming from thank you very much.
Now how do I change it from that 3750e switch to 6513
What should i look for in the switch that is sending out default route?
11-26-2013 01:44 PM
Hi Adam,
You're most welcome.
Now how do I change it from that 3750e switch to 6513
What should i look for in the switch that is sending out default route?
Most probably, you have static default route configured (ip route 0.0.0.0 0.0.0.0 ip_address) and you are injecting it into EIGRP through redistribute static command under router eigrp AS_number.
So if I got this correctly - you want to change default route that is pointing towards 3750e to ip of 6513, right?
So look for statement like that (ip route 0.0.0.0 0.0.0.0 ip_address_of 3750e) in running config, put no in front of it
Switch(config)#no ip route 0.0.0.0 0.0.0.0 ip_address_of_3750e
and afterwards do something like this:
Switch(config)#ip route 0.0.0.0 0.0.0.0 ip_address_of_6513
But bear in mind, that the Router will have to perform recursive lookup for the IP address provided in the ip route statement - in other words, it won't work properly if the device does not know how to get to (does not have any route for) that specific IP address.
Best regards,
Jan
11-27-2013 07:05 AM
Well, you are correct I was trying to change from one ip address 3750e to 6513 default route though eirgp.
But the senior engineer made the change last before i could do more research.
It was just weird that eigrp routing was sending out the default route to a location we dont used much then from that route it would go to the 6513.
So if i explain this better
traceroute 8.8.8.8
this would send the packet to default route then from that switch it would send it to it's default route which is 6513 then to internet and back
3750e --> 3750e --> 6513 --> internet instead of 3750e --> 6513
Thank you very much for all your help
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