From: Piotr (usaccie@gmail.com)
Date: Sun Nov 02 2008 - 21:22:45 ARST
On the routers I left the MTU at default,m 1500. On the switches (3550/3560)
I set the system MTU to 1500 (system MTU 1500 or system MTU routing 1500.
Where allowed on the interface I set ip mtu 1500).
Debugs don't show me anything. I was looking to shut the messages off with a
command similar to ip ospf mtu-ignore but I don't see one under the
interface.
I can try and set the metric for all devices in the AS and see what happens.
On Sun, Nov 2, 2008 at 3:02 PM, Bob Sinclair <bob@bobsinclair.net> wrote:
> Piotr,
>
> Check that the MTUs match on both devices. I notice one is a switch.
> Though the specs do not require equal MTU (like OSPF does) Cisco routers
> have been known to drop EIGRP packets over MTU mismatch issues.
> The K-value mismatch error can be caused when the near side router does not
> support the "goodbye" message, added around 12.2(3), but the far side does.
>
> HTH,
>
> Bob Sinclair CCIE 10427 CCSI 30427
> www.netmasterclass.net
>
> Piotr wrote:
>
>> Switch:
>>
>> 05:04:04: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor
>> 183.1.105.5(FastEthernet0/18) is up: new adjacency
>> --More--
>> 05:05:23: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor
>> 183.1.105.5(FastEthernet0/18) is down: K-value mismatch
>> --More--
>> 05:05:26: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor
>> 183.1.105.5(FastEthernet0/18) is up: new adjacency
>>
>> router eigrp 100
>> network 183.1.105.10 0.0.0.0
>> network 183.1.107.10 0.0.0.0
>> no auto-summary
>> eigrp router-id 150.1.10.10
>>
>> interface FastEthernet0/18
>> no switchport
>> ip address 183.1.105.10 255.255.255.0
>>
>>
>> Routing Protocol is "eigrp 100"
>> Outgoing update filter list for all interfaces is not set
>> Incoming update filter list for all interfaces is not set
>> Default networks flagged in outgoing updates
>> Default networks accepted from incoming updates
>> EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
>> EIGRP maximum hopcount 100
>> EIGRP maximum metric variance 1
>> Redistributing: eigrp 100
>> EIGRP NSF-aware route hold timer is 240s
>> Automatic network summarization is not in effect
>> Maximum path: 4
>> Routing for Networks:
>> 183.1.105.10/32
>> 183.1.107.10/32
>> Routing Information Sources:
>> Gateway Distance Last Update
>> 183.1.107.7 90 00:07:43
>> Distance: internal 90 external 170
>>
>>
>>
>>
>> router:
>> *Nov 2 13:55:54.926: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor
>> 183.1.105.10 (FastEthernet0/0) is down: retry limit exceeded
>> RSRack1R5(config-router)#
>> *Nov 2 13:55:57.322: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor
>> 183.1.105.10 (FastEthernet0/0) is up: new adjacency
>> RSRack1R5(config-router)#
>> *Nov 2 13:57:16.834: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor
>> 183.1.105.10 (FastEthernet0/0) is down: retry limit exceeded
>> RSRack1R5(config-router)#
>> *Nov 2 13:57:20.290: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor
>> 183.1.105.10 (FastEthernet0/0) is up: new adjacency
>>
>>
>> router eigrp 100
>> network 183.1.105.5 0.0.0.0
>> no auto-summary
>> eigrp router-id 150.1.5.5
>>
>>
>> interface FastEthernet0/0
>> ip address 183.1.105.5 255.255.255.0
>> duplex auto
>> speed auto
>>
>>
>> Routing Protocol is "eigrp 100"
>> Outgoing update filter list for all interfaces is not set
>> Incoming update filter list for all interfaces is not set
>> Default networks flagged in outgoing updates
>> Default networks accepted from incoming updates
>> EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
>> EIGRP maximum hopcount 100
>> EIGRP maximum metric variance 1
>> Redistributing: eigrp 100
>> EIGRP NSF-aware route hold timer is 240s
>> Automatic network summarization is not in effect
>> Maximum path: 4
>> Routing for Networks:
>> 183.1.105.5/32
>> Routing Information Sources:
>> Gateway Distance Last Update
>> 183.1.105.10 90 00:09:49
>> Distance: internal 90 external 170
>>
>>
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>>
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