Re: [c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x

2019-07-09 Thread adamv0025
Try removing the "ip ospf mtu-ignore" from both ends -see if the adjacency
comes up (past exchange).
Try enabling debug to see what exactly is going on -you should see straight
away what the crux of the problem is. 

adam
> -Original Message-
> From: cisco-nsp  On Behalf Of Richard
> Mikisa
> Sent: Tuesday, July 9, 2019 4:58 PM
> To: cisco-nsp@puck.nether.net
> Subject: [c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x
> 
> Hi All,
> 
> I am running OSPF across a point to point link between a Nexus 7000 and an
> ASR1000x.
> 
> The OSPF works fine but every couple of hours, it breaks and neighbor
state
> goes into EXCHANGE and remains there for another 40 minutes or so. It then
> goes into full, OSPF comes up and all is well for another couple of hours
or so
> and then the cycle starts again. All the time, IP connectivity between the
two
> point to point IPs is up.
> 
> Configuration as below..
> 
> ASR1001x#sh run int g0/0/1
> interface GigabitEthernet0/0/1
>  description ** MPLS London -  SO031732 **  mtu 9216  ip address
> 10.32.250.17 255.255.255.252  ip ospf network point-to-point  ip ospf mtu-
> ignore  negotiation auto  cdp enable end
> 
> ASR1000x#sh ip ospf neighbor
> 
> Neighbor ID Pri   State   Dead Time   Address
Interface
> 40.1.1.1  0   EXCHANGE/  -00:00:3310.32.250.18
> GigabitEtherne
> t0/0/1
> 10.32.8.253   1   FULL/DR 00:00:3210.32.250.1
> GigabitEtherne
> t0/0/0
> 
> 
> On the Nexus
> N7K1-LON-AGG# sh run int vlan 3960
> 
> interface Vlan3960
>   no shutdown
>   mtu 9216
>   ip address 10.32.250.18/30
>   ip ospf cost 1
>   ip ospf network point-to-point
>   no ip ospf passive-interface
>   ip ospf mtu-ignore
>   ip router ospf 100 area 0.0.0.32
> 
> N7K1-LON-AGG# sh ip ospf neighbors 10.32.250.2  OSPF Process ID 100 VRF
> default  Total number of neighbors: 15
>  Neighbor ID Pri StateUp Time  Address Interface
>  10.32.250.2   1 EXCHANGE/ -  00:05:06 10.32.250.17Vlan3960
> N7K1-LON-AGG#
> 
> And the logs on the ASR
> 
> Jul  9 14:33:00.682: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
> GigabitEthernet0/0/1 from FULL to DOWN, Neighbor Down: Too many
> retransmissions Jul  9 14:34:00.683: %OSPF-5-ADJCHG: Process 100, Nbr
> 40.1.1.1 on
> GigabitEthernet0/0/1 from DOWN to DOWN, Neighbor Down: Ignore timer
> expired Jul  9 14:34:46.962: %CLNS-5-ADJCHANGE: ISIS (Overlay1): Adjacency
> to N7K1-LON-OTV (Overlay1) Down, hold time expired Jul  9 14:39:56.543:
> %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
> GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Interface
> down or detached Jul  9 14:55:20.865: %OSPF-5-ADJCHG: Process 100, Nbr
> 40.1.1.1 on
> GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Interface
> down or detached .Jul  9 15:06:25.955: %OSPF-5-ADJCHG: Process 100, Nbr
> 40.1.1.1 on
> GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Too many
> retransmissions .Jul  9 15:07:25.955: %OSPF-5-ADJCHG: Process 100, Nbr
> 40.1.1.1 on
> GigabitEthernet0/0/1 from DOWN to DOWN, Neighbor Down: Ignore timer
> expired .Jul  9 15:37:57.514: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
> GigabitEthernet0/0/1 from LOADING to FULL, Loading Done .Jul  9
> 15:38:03.296: %CLNS-5-ADJCHANGE: ISIS (Overlay1): Adjacency to
> 8478.AC22.FEC3 (Overlay1) Up, new adjacency .Jul  9 15:42:25.399:
> %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user:
> richard.mikisa] [Source: 10.0.1.2] [localport: 22] at 15:42:25 UTC Tue Jul
9 2019
> 
> 
> Can someone advise on where to look?
> --
> cheers
> Richard
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Re: [c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x

2019-07-09 Thread Nick Cutting
Is that a dark fiber P2P or a an ISP provided "L2 over L3 P2P"?  
If it's the latter like an eLine link - could they be re-routing traffic on 
their underlay where the mtu changes maybe?

-Original Message-
From: cisco-nsp  On Behalf Of Richard Mikisa
Sent: Tuesday, July 9, 2019 11:58 AM
To: cisco-nsp@puck.nether.net
Subject: [c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x

This message originates from outside of your organisation.

Hi All,

I am running OSPF across a point to point link between a Nexus 7000 and an 
ASR1000x.

The OSPF works fine but every couple of hours, it breaks and neighbor state 
goes into EXCHANGE and remains there for another 40 minutes or so. It then goes 
into full, OSPF comes up and all is well for another couple of hours or so and 
then the cycle starts again. All the time, IP connectivity between the two 
point to point IPs is up.

Configuration as below..

ASR1001x#sh run int g0/0/1
interface GigabitEthernet0/0/1
 description ** MPLS London -  SO031732 **  mtu 9216  ip address 10.32.250.17 
255.255.255.252  ip ospf network point-to-point  ip ospf mtu-ignore  
negotiation auto  cdp enable end

ASR1000x#sh ip ospf neighbor

Neighbor ID Pri   State   Dead Time   Address Interface
40.1.1.1  0   EXCHANGE/  -00:00:3310.32.250.18
GigabitEtherne
t0/0/1
10.32.8.253   1   FULL/DR 00:00:3210.32.250.1
GigabitEtherne
t0/0/0


On the Nexus
N7K1-LON-AGG# sh run int vlan 3960

interface Vlan3960
  no shutdown
  mtu 9216
  ip address 10.32.250.18/30
  ip ospf cost 1
  ip ospf network point-to-point
  no ip ospf passive-interface
  ip ospf mtu-ignore
  ip router ospf 100 area 0.0.0.32

N7K1-LON-AGG# sh ip ospf neighbors 10.32.250.2  OSPF Process ID 100 VRF default 
 Total number of neighbors: 15
 Neighbor ID Pri StateUp Time  Address Interface
 10.32.250.2   1 EXCHANGE/ -  00:05:06 10.32.250.17Vlan3960
N7K1-LON-AGG#

And the logs on the ASR

Jul  9 14:33:00.682: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from FULL to DOWN, Neighbor Down: Too many retransmissions 
Jul  9 14:34:00.683: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from DOWN to DOWN, Neighbor Down: Ignore timer expired Jul 
 9 14:34:46.962: %CLNS-5-ADJCHANGE: ISIS (Overlay1): Adjacency to N7K1-LON-OTV 
(Overlay1) Down, hold time expired Jul  9 14:39:56.543: %OSPF-5-ADJCHG: Process 
100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Interface down or 
detached Jul  9 14:55:20.865: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Interface down or 
detached .Jul  9 15:06:25.955: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Too many 
retransmissions .Jul  9 15:07:25.955: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 
on
GigabitEthernet0/0/1 from DOWN to DOWN, Neighbor Down: Ignore timer expired 
.Jul  9 15:37:57.514: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from LOADING to FULL, Loading Done .Jul  9 15:38:03.296: 
%CLNS-5-ADJCHANGE: ISIS (Overlay1): Adjacency to
8478.AC22.FEC3 (Overlay1) Up, new adjacency .Jul  9 15:42:25.399: 
%SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user:
richard.mikisa] [Source: 10.0.1.2] [localport: 22] at 15:42:25 UTC Tue Jul 9 
2019


Can someone advise on where to look?
--
cheers
Richard
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Re: [c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x

2019-07-09 Thread Adrian Minta

Multicast.

On 7/9/19 6:58 PM, Richard Mikisa wrote:

Hi All,

I am running OSPF across a point to point link between a Nexus 7000
and an ASR1000x.

The OSPF works fine but every couple of hours, it breaks and neighbor
state goes into EXCHANGE and remains there for another 40 minutes or
so. It then goes into full, OSPF comes up and all is well for another
couple of hours or so and then the cycle starts again. All the time,
IP connectivity between the two point to point IPs is up.

Configuration as below..

ASR1001x#sh run int g0/0/1
interface GigabitEthernet0/0/1
  description ** MPLS London -  SO031732 **
  mtu 9216
  ip address 10.32.250.17 255.255.255.252
  ip ospf network point-to-point
  ip ospf mtu-ignore
  negotiation auto
  cdp enable
end

ASR1000x#sh ip ospf neighbor

Neighbor ID Pri   State   Dead Time   Address Interface
40.1.1.1  0   EXCHANGE/  -00:00:3310.32.250.18
GigabitEtherne
 t0/0/1
10.32.8.253   1   FULL/DR 00:00:3210.32.250.1
GigabitEtherne
 t0/0/0


On the Nexus
N7K1-LON-AGG# sh run int vlan 3960

interface Vlan3960
   no shutdown
   mtu 9216
   ip address 10.32.250.18/30
   ip ospf cost 1
   ip ospf network point-to-point
   no ip ospf passive-interface
   ip ospf mtu-ignore
   ip router ospf 100 area 0.0.0.32

N7K1-LON-AGG# sh ip ospf neighbors 10.32.250.2
  OSPF Process ID 100 VRF default
  Total number of neighbors: 15
  Neighbor ID Pri StateUp Time  Address Interface
  10.32.250.2   1 EXCHANGE/ -  00:05:06 10.32.250.17Vlan3960
N7K1-LON-AGG#

And the logs on the ASR

Jul  9 14:33:00.682: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from FULL to DOWN, Neighbor Down: Too many
retransmissions
Jul  9 14:34:00.683: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from DOWN to DOWN, Neighbor Down: Ignore timer
expired
Jul  9 14:34:46.962: %CLNS-5-ADJCHANGE: ISIS (Overlay1): Adjacency to
N7K1-LON-OTV (Overlay1) Down, hold time expired
Jul  9 14:39:56.543: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Interface
down or detached
Jul  9 14:55:20.865: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Interface
down or detached
.Jul  9 15:06:25.955: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Too many
retransmissions
.Jul  9 15:07:25.955: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from DOWN to DOWN, Neighbor Down: Ignore timer
expired
.Jul  9 15:37:57.514: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from LOADING to FULL, Loading Done
.Jul  9 15:38:03.296: %CLNS-5-ADJCHANGE: ISIS (Overlay1): Adjacency to
8478.AC22.FEC3 (Overlay1) Up, new adjacency
.Jul  9 15:42:25.399: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user:
richard.mikisa] [Source: 10.0.1.2] [localport: 22] at 15:42:25 UTC Tue
Jul 9 2019


Can someone advise on where to look?


--
Best regards,
Adrian Minta


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[c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x

2019-07-09 Thread Richard Mikisa
Hi All,

I am running OSPF across a point to point link between a Nexus 7000
and an ASR1000x.

The OSPF works fine but every couple of hours, it breaks and neighbor
state goes into EXCHANGE and remains there for another 40 minutes or
so. It then goes into full, OSPF comes up and all is well for another
couple of hours or so and then the cycle starts again. All the time,
IP connectivity between the two point to point IPs is up.

Configuration as below..

ASR1001x#sh run int g0/0/1
interface GigabitEthernet0/0/1
 description ** MPLS London -  SO031732 **
 mtu 9216
 ip address 10.32.250.17 255.255.255.252
 ip ospf network point-to-point
 ip ospf mtu-ignore
 negotiation auto
 cdp enable
end

ASR1000x#sh ip ospf neighbor

Neighbor ID Pri   State   Dead Time   Address Interface
40.1.1.1  0   EXCHANGE/  -00:00:3310.32.250.18
GigabitEtherne
t0/0/1
10.32.8.253   1   FULL/DR 00:00:3210.32.250.1
GigabitEtherne
t0/0/0


On the Nexus
N7K1-LON-AGG# sh run int vlan 3960

interface Vlan3960
  no shutdown
  mtu 9216
  ip address 10.32.250.18/30
  ip ospf cost 1
  ip ospf network point-to-point
  no ip ospf passive-interface
  ip ospf mtu-ignore
  ip router ospf 100 area 0.0.0.32

N7K1-LON-AGG# sh ip ospf neighbors 10.32.250.2
 OSPF Process ID 100 VRF default
 Total number of neighbors: 15
 Neighbor ID Pri StateUp Time  Address Interface
 10.32.250.2   1 EXCHANGE/ -  00:05:06 10.32.250.17Vlan3960
N7K1-LON-AGG#

And the logs on the ASR

Jul  9 14:33:00.682: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from FULL to DOWN, Neighbor Down: Too many
retransmissions
Jul  9 14:34:00.683: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from DOWN to DOWN, Neighbor Down: Ignore timer
expired
Jul  9 14:34:46.962: %CLNS-5-ADJCHANGE: ISIS (Overlay1): Adjacency to
N7K1-LON-OTV (Overlay1) Down, hold time expired
Jul  9 14:39:56.543: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Interface
down or detached
Jul  9 14:55:20.865: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Interface
down or detached
.Jul  9 15:06:25.955: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from EXCHANGE to DOWN, Neighbor Down: Too many
retransmissions
.Jul  9 15:07:25.955: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from DOWN to DOWN, Neighbor Down: Ignore timer
expired
.Jul  9 15:37:57.514: %OSPF-5-ADJCHG: Process 100, Nbr 40.1.1.1 on
GigabitEthernet0/0/1 from LOADING to FULL, Loading Done
.Jul  9 15:38:03.296: %CLNS-5-ADJCHANGE: ISIS (Overlay1): Adjacency to
8478.AC22.FEC3 (Overlay1) Up, new adjacency
.Jul  9 15:42:25.399: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user:
richard.mikisa] [Source: 10.0.1.2] [localport: 22] at 15:42:25 UTC Tue
Jul 9 2019


Can someone advise on where to look?
-- 
cheers
Richard
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