Redistribute connected route-map and redistribute connected on same AS

[mahesh18]

Hi Everyone,

I found that if under router eigrp if we have redistribute connected configured as below---

Router Eigrp 123

redistribute connected

If we add the config ---redistribute connected route-map  then the redistribute connected is gone.

Even if i try to add the redistributed connected config does  not take it.

Need to know if this is the default behaviour?

Thanks

Mahesh

[Reza Sharifi · Accepted solution]

Hi Mahesh,

That is correct.  After you do a redistribute connected with a route map if you want to go back and do a redistribute command without the route map, you first have to remove the existing one and then add redistribute command without the route map.

Reza

HTH

[Giuseppe Larosa · Accepted solution]

Hello Mahesh,

what you see is normal as the statement

redistribute connected route-map is more specific then redistribute connected as it configures to perform redistribution of only those connected routes matching any of the specified route-map blocks

The route-map block needs to have a a permit action and the IP prefix has to be permitted matched on the match conditions specified on the route-map block (for example by an ACL with a permit statement).

IF you try to remove the specific statement

no red connected route-map

you may be able to see the general comand to appear again under router eigrp

Hope to help

Giuseppe

[mahesh18]

Hi Giuseppe,

Nice to see you after long time.

Also i found that if under same device

Router Eigrp 123

if we have redistribute connected route map and also distribute-list  configured  then the Router does not advertise any

EIGRP routes to nei router but it becomes EIGRP nei.

When i remove distribute list out from the config then the nei router learn the routes filtered by route map.

Need to confirm if this is also default behaviour?

Regards

Mahesh

[Giuseppe Larosa · Accepted solution]

Hello Mahesh,

thanks for your kind words I am really busy in these days so I am less present here in the forums

I should see the distribute list configuration to be able to say something more precise, however it is possible as the distribute list is a different type of route filtering that EIGRP supports (OSPF doesn't support this).

The route-map filters the connected routes entering the EIGRP topology and the distribute list specifies what is advertised out of an interface or out any interface if applied at process level.

So yes, only routes matching both the route-map AND the access-list referred by distribute-list command can be advertised.

So the end result can be no EIGRP route advertised out, but still the EIGRP neighboship forms

This is possible

Hope to help

Giuseppe

[mahesh18]

Hi Giuseppe,

Here is config from R1

router eigrp 123

redistribute connected route-map RM_CONNECTED_TO_EIGRP123

passive-interface default

no passive-interface FastEthernet1/0/1

no passive-interface FastEthernet1/0/3

distribute-list 9 out

no auto-summary

network 10.0.0.0 0.0.0.

access-list 9 permit 5.5.5.5 log

access-list 9 remark Prefixes advertised via EIGRP

access-list 9 permit 172.16.1.0 0.0.0.255

access-list 9 permit 172.16.3.0 0.0.0.255

access-list 9 deny   any

access-list 10 remark Route Map EIGRP

access-list 10 permit 173.16.1.0 0.0.0.255

access-list 10 permit 173.16.3.0 0.0.0.255

access-list 10 permit 10.0.0.0 0.0.0.255

access-list 10 deny   any

route-map RM_CONNECTED_TO_EIGRP123 permit 10

description Prefixes advertised via EIGRP

match ip address 10

R1#sh ip eigrp nei

EIGRP-IPv4:(123) neighbors for process 123

H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq

                                            (sec)         (ms)       Cnt Num

0   10.0.0.2                Fa1/0/1           13 00:35:48    6   200  0  101

R2#sh ip eigrp  nei

EIGRP-IPv4:(123) neighbors for process 123

H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq

                                            (sec)         (ms)       Cnt Num

0   10.0.0.1                Fa2/0/1           11 00:36:29    5   200  0  62

So above is the info that shows R1 and R2 are Eigrp neis but R2 is not learning any route from R1.

Regards

Mahesh

[Giuseppe Larosa · Accepted solution]

Hello Mahesh,

I see

please

post show ip route 172.16.1.0 taken on R2

Are you sure that R2 hasn't better routes then EIGRP routes?

Hope to help

Giuseppe

[mahesh18]

Hi Guiseppe,

Here is info from R2

R2#sh ip route 172.16.1.0

% Network not in table

R2#

R2 is learning those routes from R1 only

Thanks

Mahesh

[Giuseppe Larosa · Accepted solution]

Hello Mahesh,

I see just another check post

show ip route 172.16.1.0 taken from R1

>> no auto-summary

this is good otherwise a summarized route would go out

that show contains important info

Hope to help

Giuseppe

[mahesh18]

Hi Giuseppe,

Here is info

R1# sh ip route 172.16.1.0
Routing entry for 172.16.1.0/24
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Redistributing via eigrp 123
  Routing Descriptor Blocks:
  * directly connected, via Loopback1
      Route metric is 0, traffic share count is 1

R1#

Regards

Mahesh

[Giuseppe Larosa · Accepted solution]

Hello Mahesh,

R1# sh ip route 172.16.1.0

Routing entry for 172.16.1.0/24

  Known via "connected", distance 0, metric 0 (connected, via interface)

  Redistributing via eigrp 123

the route is not advertised by EIGRP, when you remove the distribute list an additional line should appear in show ip route 172.16.1.0/24 output telling "advertised by EIGRP"

Hope to help

Giuseppe

[mahesh18]

Hi Giuseppe,

Thanks for all your replies.

so  i tested and learned something new from you  about  Eigrp.

Best Regards

Mahesh