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EIGRP neighbors lost

horvaia
Level 1
Level 1

Hello,

I have a problem. When I remove the ip address of this sub-interface fa0/0.32 all of my eigrp neighbors lost except this 192.168.11.214 neighbor. Why could it be ?

The configs:

---------------------------

interface FastEthernet0/0.32

encapsulation dot1Q 32

ip address 192.168.11.65 255.255.255.252

no cdp enable

end

---------------------------

interface FastEthernet3/0

ip address 192.168.11.213 255.255.255.252

no ip proxy-arp

ip route-cache flow

duplex full

no cdp enable

end

---------------------------

router eigrp 1001

redistribute connected route-map BGP-nexthop

redistribute static

redistribute ospf 9001

network 192.168.0.0

network 192.168.4.20 0.0.0.3

network 192.168.11.0

network 192.168.16.88 0.0.0.7

default-metric 10 200 150 100 1500

no auto-summary

no eigrp log-neighbor-changes

!

---------------------------

#sh ip eigrp neighbors

IP-EIGRP neighbors for process 1001

H Address Interface Hold Uptime SRTT RTO Q Seq Type

(sec) (ms) Cnt Num

0 192.168.11.214 Fa3/0 13 01:12:21 1 200 0 5627604

7 192.168.0.240 Fa0/0.100 13 01:15:01 12 200 0 991721

6 192.168.0.239 Fa0/0.100 10 01:15:01 2 200 0 679741

5 192.168.0.237 Fa0/0.100 13 01:15:01 12 200 0 991664

4 192.168.0.244 Fa0/0.100 11 01:15:02 13 200 0 734500

3 192.168.0.250 Fa0/0.100 14 01:15:02 4 200 0 991926

2 192.168.4.22 Fa0/0.14 11 01:15:03 1 200 0 930936

1 192.168.0.254 Fa0/0.100 14 01:15:03 12 200 0 734611

---------------------------

#sh ip eigrp interfaces

IP-EIGRP interfaces for process 7007

Xmit Queue Mean Pacing Time Multicast Pending

Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes

Fa0/0.100 6 0/0 11 0/10 50 0

Fa0/0.14 1 0/0 1 0/10 50 0

Fa3/0 1 0/0 1 0/10 50 0

Et4/0 0 0/0 0 0/10 0 0

Fa0/0.32 0 0/0 0 0/10 0 0

---------------------------

Cisco Internetwork Operating System Software

IOS (tm) 7200 Software (C7200-P-M), Version 12.2(17a), RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2003 by cisco Systems, Inc.

Compiled Thu 19-Jun-03 12:41 by pwade

Image text-base: 0x60008940, data-base: 0x610D8000

ROM: System Bootstrap, Version 12.0(19990210:195103) [12.0XE 105], DEVELOPMENT SOFTWARE

BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(9)S, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

Last reset from power-on

Channelized E1, Version 1.0.

X.25 software, Version 3.0.0.

Bridging software.

Primary Rate ISDN software, Version 1.1.

4 Ethernet/IEEE 802.3 interface(s)

4 FastEthernet/IEEE 802.3 interface(s)

1 Gigabit Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

8 Channelized E1/PRI port(s)

125K bytes of non-volatile configuration memory.

46976K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).

4096K bytes of Flash internal SIMM (Sector size 256K).

Configuration register is 0x102

14 Replies 14

Richard Burts
Hall of Fame
Hall of Fame

I find it difficult to understand what you are asking. You say that when you remove IP address from fa0/0.32 you lose all eigrp neighbors except 192.168.11.214 neighbor and yet the show ip eigrp neighbor show that there are 7 more eigrp neighbors.

It would probably be helpful if you could show us what the config is before the change and what the eigrp neighbors are before the change, and then show us what the config is after the change and what the eigrp neighbors are after the change. This could help us understand what your situation is.

If you are saying that you remove the IP address from the subinterface fa0/0.32 and eigrp neighbors that had been learned by that subinterface are lost, then that is normal behavior. When you remove the IP address from the subinterface then it can no longer talk IP and any neighbors that had been learned on that subinterface can no longer talk to that router. This is normal.

HTH

Rick

HTH

Rick

Dear Rick,

Thanks for your answer.

The change that I made:

I just remove the ip address from this subinterface:

fa0/0.32. The "router eigrp 1001" config is in my first post.

The status before the changes:

------------------------------

interface FastEthernet0/0.32

encapsulation dot1Q 32

ip address 192.168.11.65 255.255.255.252

no cdp enable

end

interface FastEthernet3/0

ip address 192.168.11.213 255.255.255.252

no ip proxy-arp

ip route-cache flow

duplex full

no cdp enable

end

#sh ip eigrp neighbors

IP-EIGRP neighbors for process 1001

H Address Interface Hold Uptime SRTT RTO Q Seq Type

(sec) (ms) Cnt Num

0 192.168.11.214 Fa3/0 13 01:12:21 1 200 0 5627604

7 192.168.0.240 Fa0/0.100 13 01:15:01 12 200 0 991721

6 192.168.0.239 Fa0/0.100 10 01:15:01 2 200 0 679741

5 192.168.0.237 Fa0/0.100 13 01:15:01 12 200 0 991664

4 192.168.0.244 Fa0/0.100 11 01:15:02 13 200 0 734500

3 192.168.0.250 Fa0/0.100 14 01:15:02 4 200 0 991926

2 192.168.4.22 Fa0/0.14 11 01:15:03 1 200 0 930936

1 192.168.0.254 Fa0/0.100 14 01:15:03 12 200 0 734611

#sh ip eigrp interfaces

IP-EIGRP interfaces for process 1001

Xmit Queue Mean Pacing Time Multicast Pending

Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes

Fa0/0.100 6 0/0 11 0/10 50 0

Fa0/0.14 1 0/0 1 0/10 50 0

Fa3/0 1 0/0 1 0/10 50 0

Et4/0 0 0/0 0 0/10 0 0

Fa0/0.32 0 0/0 0 0/10 0 0

The status after the changes:

-----------------------------

interface FastEthernet0/0.32

encapsulation dot1Q 32

no cdp enable

shutdown

end

interface FastEthernet3/0

ip address 192.168.11.213 255.255.255.252

no ip proxy-arp

ip route-cache flow

duplex full

no cdp enable

end

#sh ip eigrp neighbors

IP-EIGRP neighbors for process 1001

H Address Interface Hold Uptime SRTT RTO Q Seq Type

(sec) (ms) Cnt Num

0 192.168.11.214 Fa3/0 13 01:12:21 1 200 0 5627604

---------------------------

#sh ip eigrp interfaces

IP-EIGRP interfaces for process 1001

Xmit Queue Mean Pacing Time Multicast Pending

Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes

Fa3/0 1 0/0 1 0/10 50 0

I continue to be puzzled by inconsistencies in your posting. For example I do not see any sign that there is an EIGRP neighbor on subinterface FastEther0/0.32 before the subinterface is shutdown.

If all that you did was to remove the IP address from the subinterface, then I do not understand how the subinterface got into a shutdown state, which your post clearly shows that it is shutdown.

Please post the output of show ip interface brief so that we can understand the state of all of the interfaces.

HTH

Rick

HTH

Rick

There aren't any inconsistencies this is the configuration of my equipment.

This is the point! There wasn't any EIGRP neighbor on that subinterface! But the EIGRP listens on

that interface because the config (network 192.168.11.0). I don't think that this is a problem.

After I removed the ip address of the subinterface I put that in shutdown status. It's a habit with me,

sorry if this cause you any problem.

before:

FastEthernet3/0 192.168.11.213 YES NVRAM up up

FastEthernet0/0.32 192.168.11.65 YES manual up up

after:

FastEthernet3/0 192.168.11.213 YES NVRAM up up

FastEthernet0/0.32 unassigned YES unset administratively down down

Could we see the config on F0/0.100 please? That is where most of your neighbors seem to be detected before the change.

Sorry to make a banale suggestion, but you didn't shut down F0/0 at the same time by any chance? Thought not, but just like to check.

I'm really puzzled what happened to your 192.168.4.22 neighbor - that isn't anywhere near the network you are having problems with, except that it shares a physical interface.

I presume the other end of this trunk is a switch. What is the native VLAN? Could you post all of the F0/0 config including all the subinterfaces?

Kevin Dorrell

Luxembourg

Hi Kevin,

Thanks for your help.

>Could we see the config on F0/0.100 please? That is where most of your neighbors seem

>to be detected before the change.

Here is the config of Fa0/0.100:

interface FastEthernet0/0.100

encapsulation dot1Q 100

ip address 192.168.0.249 255.255.255.0

no cdp enable

end

>Sorry to make a banale suggestion, but you didn't shut down F0/0 at the same time by any chance?

>Thought not, but just like to check.

I didn't shutdown the Fa0/0 because I could ping all the other neighbors on the 192.168.0.0/24

network.

>I'm really puzzled what happened to your 192.168.4.22 neighbor - that isn't anywhere near the

>network you are having problems with, except that it shares a physical interface.

This is the interface's config:

interface FastEthernet0/0.14

encapsulation dot1Q 14

ip address 192.168.4.21 255.255.255.252

no ip redirects

no ip mroute-cache

no cdp enable

end

I have also lost this neighbor but I was able to ping the remote end too (192.168.4.22).

>I presume the other end of this trunk is a switch. What is the native VLAN?

>Could you post all of the F0/0 config including all the subinterfaces?

See the attached file.

OK, thanks for the information - I'm thinking it through now. The particular thing I was wondering about was whether the address was the highest active IP address in the box at the time the EIGRP was started, in which case it is the router ID. So when you delete it, the RID changes. But I am still thinking through whether this has any repercussions as regards the neighborship.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800949ab.shtml

Sorry, EIGRP is not my strong point. This is where I am reading from:

http://www.cisco.com/en/US/tech/tk365/tk207/tsd_technology_support_sub-protocol_home.html

Just one tip: I would enable eigrp log-neighbor-changes. You might get some clues as to what is going on here.

Don't know whether this document might help:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094613.shtml#trouble_eigrp_nc

Kevin Dorrell

Luxembourg

Kevin,

Thanks for your info. The RID can't be the problem

beacuse:

#sh ip eigrp topology

IP-EIGRP Topology Table for AS(1001)/ID(192.168.17.4)

interface Loopback0

ip address 192.168.17.4 255.255.255.255

end

Thanks for the links, I will walk through and let's

see what I find...

But the whole thing is very strange because,

when I made the changes first I remove the ip address

of fa0/0.32 and I put the subinterface in adm.

shutdown status and all my eigrp neighbors except one

were lost. The one where I was able to see my

EIGRP neighbor was a real interface.

I really don't know what did I wrong...

I would start logging adjacency changes, and see what that comes up with.

Kevin and all,

I found the solution. I have to upgrade my IOS

because of bug. I had assistance from

my distributor (he helped me a lot), here is the description of my problem and bug id:

A bug specific to some interface drivers which

lead to EIGRP multicast MAC address to be removed from

interface hardware when listener was removed on one

subinterface only.

The sequence is like that - IP address has been removed

from subinterface, so EIGRP needs to be disabled on that

interface, so EIGRP signals that it does not want to listen

to group 224.0.0.10 anymore (this is IP address used by EIGRP

for Hello packets). Due to the bug MAC address was removed

even despite the fact that EIGRP was still enabled on other

subinterfaces of this physical interface (normally MAC

address should be removed from hardware only when the LAST

subinterface stops listening for EIGRP). End result is that

router stops hearing EIGRP on all subinterfaces of the interface.

bug ID: CSCed67358

That's interesting to know, and I'm glad you found the solution.

Could you check that bug number please? I tried to look that one up in the database, and it was about IPv6 and PIM. It describes a similar effect when removing ipv6 pim from a subinterface, but it seems pretty far removed from EIGRP.

Kevin Dorrell

Luxembourg

The guy who gave me this info said this too:

----

I confirm that you are hitting bug which I suspected. Its

ID is CSCed67358. The bug itself is talking about IPv6 but it

affects all protocols using multicast to propagate Hellos

(IPv6, OSPF, EIGRP, ISIS and so on).

----

So I have to upgrade...

Can you ping from f0/0.100 to those 192.168.0.x neighbors after removing the IP address?

Can you ping from f0/0.14 to those 192.168.4.x neighbors after removing the IP address?

Hello,

I could ping all the neighbors' ip but, when

I issue a sh ip eigrp neighbors command I saw only

one neighbors as I wrote before.

Isn't it a cisco ios issue?

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