OSPF neighborship problem with OOB network management

[knseja001]

good day

i tried to configure 2921, ASR1000-x with OOB using ospf but my routers cant form adjacency please help here are my configs. using ip protocols on 2921 i can see the routed networks however on ASR1k i can only see routed protocols on the vrf shw protocols command. i suspect vrf is the reason why i cant fully form adjacency but not too sure, changed priorities to make also on the ASR but still :( 

2921 router config

router(config)#interface gigabitethernet0/0

router(config-if)#description link to Management Router 

router(config-if)#ip address x.x.x.x. <mask>

router(config-if)#no ip redirects

router(config-if)#no ip proxy-arp

router(config-if)#ip ospf network broadcast

router(config-if)#ip ospf priority 0

router(config-if)#ip ospf mtu-ignore

router(config-if)#duplex auto

router(config-if)#speed auto

router(config-if)#no shut

OOB OSPF config on 2921

router(config)#router ospf 100

router(config-router)#interface log-adjacency-changes

router(config-router)#passive-interface default

router(config-router)#no passive-interface  gigabitethernet0/0

router(config-router)#network x.x.x.x 0.0.0.0 area 0

router(config-router)#network x.x.x.x 0.0.0.0 area 0

router(config-router)#do write

ASR1000-x

router(config)#interface GigabitEthernet 0

router(config-if)#description link to Management Switch ks-dit-mgsw-01

router(config-if)#ip address x.x.x.x <mask>

router(config-if)#no ip redirects

router(config-if)#no ip proxy-arp

router(config-if)#ip ospf network broadcast

router(config-if)#ip ospf priority 0

router(config-if)#no shutdown

OOB OSPF config on ASR1000

router(config-if)#router ospf 100 vrf Mgmt-intf

router(config-router)#log-adjacency-changes

router(config-router)#passive-interface default

router(config-router)#no passive-interface GigabitEthernet 0

router(config-router)#network x.x.x.x 0.0.0.0 area 0

router(config-router)#network x.x.x.x 0.0.0.0 area 0

router(config-router)#do write

[Rolf Fischer]

Hello,

I'm not sure if OOB ports support routing protocols, but on a broadcast network at least one router-link will need to have an OSPF priority greater than zero.

Could you share the output of "show ip ospf 100 traffic" from the ASR after you changed back the priority?

HTH
Rolf

[knseja001]

hello Rolf

i changed priorities of both routers but it doesnt help. maybe it could be the router ospf 100 vrf <vrf name> in the ASR1k which is different from the 2921 command "router ospf 100'' the ASR has a management interface only Gigabit ethrtnet 0. i am trying to set it up in such a way that i can console to a remote site.. could you advise on how i can tacle this situation if OOb ports doesnt support routiing protocols

thank you in advance

[Rolf Fischer]

VRFs are locally significant, that's normally no problem but I'm not sure in the case of the pre-defined Mgmt-VRFs.

Could you share the output of

• show ip ospf 100 interface
• show ip ospf 100 traffic

from the ASR? Of course you can remove IPs / other critical information if you need to.

[knseja001]

good day

sh commands from ASR1k-x

sh ip ospf 100 int 

GigabitEthernet0 is up, line protocol is up
Internet Address 172.25.3.51/27, Area 0, Attached via Network Statement
Process ID 100, Router ID 172.25.3.7, Network Type BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Transmit Delay is 1 sec, State DROTHER, Priority 0
No designated router on this network
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:02
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Can be protected by per-prefix Loop-Free FastReroute
Can be used for per-prefix Loop-Free FastReroute repair paths
Index 1/2/2, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)

sh ip ospf 100 tr output

**loopback int output ommited

Interface GigabitEthernet0

Last clearing of interface traffic counters never

OSPF packets received/sent
Type Packets Bytes
RX Invalid 0 0
RX Hello 0 0
RX DB des 0 0
RX LS req 0 0
RX LS upd 0 0
RX LS ack 0 0
RX Total 0 0

TX Failed 0 0
TX Hello 35 2660
TX DB des 0 0
TX LS req 0 0
TX LS upd 0 0
TX LS ack 0 0
TX Total 35 2660

OSPF header errors
Length 0, Instance ID 0, Checksum 0, Auth Type 0,
Version 0, Bad Source 0, No Virtual Link 0,
Area Mismatch 0, No Sham Link 0, Self Originated 0,
Duplicate ID 0, Hello 0, MTU Mismatch 0,
Nbr Ignored 0, LLS 0, Unknown Neighbor 0,
Authentication 0, TTL Check Fail 0, Adjacency Throttle 0,
BFD 0, Test discard 0

OSPF LSA errors
Type 0, Length 0, Data 0, Checksum 0

Summary traffic statistics for process ID 100:

OSPF packets received/sent

Type Packets Bytes
RX Invalid 0 0
RX Hello 0 0
RX DB des 0 0
RX LS req 0 0
RX LS upd 0 0
RX LS ack 0 0
RX Total 0 0

TX Failed 0 0
TX Hello 35 2660
TX DB des 0 0
TX LS req 0 0
TX LS upd 0 0
TX LS ack 0 0
TX Total 35 2660

OSPF header errors
Length 0, Instance ID 0, Checksum 0, Auth Type 0,
Version 0, Bad Source 0, No Virtual Link 0,
Area Mismatch 0, No Sham Link 0, Self Originated 0,
Duplicate ID 0, Hello 0, MTU Mismatch 0,
Nbr Ignored 0, LLS 0, Unknown Neighbor 0,
Authentication 0, TTL Check Fail 0, Adjacency Throttle 0,
BFD 0, Test discard 0

OSPF LSA errors
Type 0, Length 0, Data 0, Checksum 0

[Rolf Fischer]

Hello,

thanks for the additional information.

It looks like Mgmt-interface Gi0 hasn't received any OSPF packet yet (all RX counters are zero).
Could you check the 2921's side as well:

• show ip ospf 100 traffic Gi0/0
  
  (if available)

We should see TX and RX hellos here.