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DD mismatch

Warren
Beginner
Beginner

Good day;

I have a pair of layer 3 switches one is an Arista switch and the other is a Cisco switch.  They are connected together over a PTP 10 gig circuit. What is going on is that about 2-3 times a day I get am getting am OSPF Adjacency teardown/establishment dude to DD  mismatch.  Now I have checked the MTU size on both ends and they are set to 1500 bytes, carries says that the circuit is clean.  The only other difference I see on the config is that the Arista switch the max/min hold times for SPFs are 5000msec while on Cisco it is set to 10000msec.  Is there anything else I am missing?  What else can I check?  

Thank you in advance!!!

Warren

2 Accepted Solutions

Accepted Solutions

Both devices saw the link drop at the same time. That, in turn will of course drop your OSPF adjacency.

I believe, you'll need to investigate and remediate the cause of the link dropping.

View solution in original post

Hi,

You are facing interface flapping issue.

Mar 22 01:19:09: %LINK-SW2_SP-3-UPDOWN: Interface TenGigabitEthernet1/4/4, changed state to down
Mar 22 01:28:00: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/4/4, changed state to up

!

!
Mar 22 01:19:09 SW-AUCL-CORE1 Ebra: 12394: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet21, changed state to down
Mar 22 01:19:09 SW-AUCL-CORE1 Rib: %OSPF-4-OSPF_ADJACENCY_TEARDOWN: NGB 10.16.160.9, interface 10.0.2.45 adjacency dropped: interface went down, state was: FULL
Mar 22 01:19:09 SW-AUCL-CORE1 Rib: %PIM-5-NBRCHG: neighbor 10.0.2.44 DOWN on interface et21
Mar 22 01:28:00 SW-AUCL-CORE1 Ebra: 12395: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet21, changed state to up

 

Please check your media, connector or any bad hardware. 

 

 

Regards,

Deepak Kumar

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution if this comment will help you!

View solution in original post

7 Replies 7

Deepak Kumar
Advocate
Advocate

Hi, 

Some parameters must match as:

1. Hello and Dead intervals
2. Area ID
3. Authentication type and password
4. Stub Area flag
5. Subnet ID and Subnet mask

 

Please check which are applied to your configuration. 

 

Regards,
Deepak Kumar

 

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution if this comment will help you!

Peter Paluch
Hall of Fame Cisco Employee Hall of Fame Cisco Employee
Hall of Fame Cisco Employee

Warren, Deepak,

Please allow me to join.

The DD packets (Database Description) would be used only when the OSPF routers detect themselves and go through ExStart and Exchange states. DD packets are not used when the OSPF routers are in the FULL mode anymore. Any problem reported with the DD packets is therefore somehow related to the OSPF neighbors falling back from the FULL adjacency state to a lesser state, and attempting to come back to the FULL state again.

Do you believe you could share the exact logging messages both from the Cisco and the Arista devices? Their exact wording and contents are very important. Thanks!

Best regards,
Peter

Hi Peter and Deepak 

 

Deepak 

all configs match thank you for the suggestion I only checked MTU size

 

Peter

agreed I thought perhaps since they where on a PTP circuit that the circuit bounce but carrier says it is all clear here is the exact log messages

 

Cisco:

Mar 22 01:19:09: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/4/4, changed state to down
Mar 22 01:19:09: %LINEPROTO-SW2_SP-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/4/4, changed state to down
Mar 22 01:19:09: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/4/4, changed state to down
Mar 22 01:19:09: %PIM-5-NBRCHG: neighbor 10.0.2.45 DOWN on interface TenGigabitEthernet1/4/4 DR
Mar 22 01:19:09: %PIM-5-DRCHG: DR change from neighbor 10.0.2.45 to 10.0.2.44 on interface TenGigabitEthernet1/4/4
Mar 22 01:19:09: %OSPF-5-ADJCHG: Process 100, Nbr 10.2.1.1 on TenGigabitEthernet1/4/4 from FULL to DOWN, Neighbor Down: Interface down or detached
Mar 22 01:19:09: %LINK-SW2_SP-3-UPDOWN: Interface TenGigabitEthernet1/4/4, changed state to down
Mar 22 01:28:00: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/4/4, changed state to up
Mar 22 01:28:00: %LINK-SW2_SP-3-UPDOWN: Interface TenGigabitEthernet1/4/4, changed state to up
Mar 22 01:28:00: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/4/4, changed state to up
Mar 22 01:28:00: %LINEPROTO-SW2_SP-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/4/4, changed state to up
Mar 22 01:28:01: %PIM-5-DRCHG: DR change from neighbor 0.0.0.0 to 10.0.2.44 on interface TenGigabitEthernet1/4/4
Mar 22 01:28:03: %PIM-5-NBRCHG: neighbor 10.0.2.45 UP on interface TenGigabitEthernet1/4/4
Mar 22 01:28:03: %PIM-5-DRCHG: DR change from neighbor 10.0.2.44 to 10.0.2.45 on interface TenGigabitEthernet1/4/4
Mar 22 01:28:07: %OSPF-5-ADJCHG: Process 100, Nbr 10.2.1.1 on TenGigabitEthernet1/4/4 from LOADING to FULL, Loading Done

 

 

Arista:

Mar 22 01:19:09 SW-AUCL-CORE1 Ebra: 12394: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet21, changed state to down
Mar 22 01:19:09 SW-AUCL-CORE1 Rib: %OSPF-4-OSPF_ADJACENCY_TEARDOWN: NGB 10.16.160.9, interface 10.0.2.45 adjacency dropped: interface went down, state was: FULL
Mar 22 01:19:09 SW-AUCL-CORE1 Rib: %PIM-5-NBRCHG: neighbor 10.0.2.44 DOWN on interface et21
Mar 22 01:28:00 SW-AUCL-CORE1 Ebra: 12395: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet21, changed state to up
Mar 22 01:28:03 SW-AUCL-CORE1 Rib: %PIM-5-NBRCHG: neighbor 10.0.2.44 UP on interface et21
Mar 22 01:28:07 SW-AUCL-CORE1 Rib: %OSPF-4-OSPF_ADJACENCY_ESTABLISHED: NGB 10.16.160.9, interface 10.0.2.45 adjacency established
Mar 22 06:08:49 SW-AUCL-CORE1 Rib: %OSPF-4-OSPF_ADJACENCY_TEARDOWN: NGB 10.16.160.9, interface 10.0.2.45 adjacency dropped: DD packet mismatch, state was: FULL
Mar 22 06:08:49 SW-AUCL-CORE1 Rib: OSPF: invalid DD packet from 10.0.2.44: Initialize flag mismatch (15)
Mar 22 06:08:54 SW-AUCL-CORE1 Rib: %OSPF-4-OSPF_ADJACENCY_ESTABLISHED: NGB 10.16.160.9, interface 10.0.2.45 adjacency established

 

 

 

 

Both devices saw the link drop at the same time. That, in turn will of course drop your OSPF adjacency.

I believe, you'll need to investigate and remediate the cause of the link dropping.

Hi,

You are facing interface flapping issue.

Mar 22 01:19:09: %LINK-SW2_SP-3-UPDOWN: Interface TenGigabitEthernet1/4/4, changed state to down
Mar 22 01:28:00: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/4/4, changed state to up

!

!
Mar 22 01:19:09 SW-AUCL-CORE1 Ebra: 12394: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet21, changed state to down
Mar 22 01:19:09 SW-AUCL-CORE1 Rib: %OSPF-4-OSPF_ADJACENCY_TEARDOWN: NGB 10.16.160.9, interface 10.0.2.45 adjacency dropped: interface went down, state was: FULL
Mar 22 01:19:09 SW-AUCL-CORE1 Rib: %PIM-5-NBRCHG: neighbor 10.0.2.44 DOWN on interface et21
Mar 22 01:28:00 SW-AUCL-CORE1 Ebra: 12395: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet21, changed state to up

 

Please check your media, connector or any bad hardware. 

 

 

Regards,

Deepak Kumar

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution if this comment will help you!

ITexpert
Participant
Participant

I believe its a Physical layer issue between anywhere both nodes.

Please update whenever you will be able to fix it.

 

Thanks,

Lovejit

ok issue solved thank you all for your help but here is what happened I called back to the 

carrier to ask if there was any issues last night, originally when I cal they person said no issues.

When I called back again after talking to you all I was told their was maintenance going on last

night that cause a hit on my circuit so that is what caused the interface to go down and back up, which in turn cause the OSPF ADJ change as well.

 

Thank you again for your help much appreciated!!!!

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