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New Member

Nexus OSPF process limit

We are cutting over from 6500 IOS to Nexus 7000 and have hit "Maximum ospf feature instance limit reached." as we configured up the 7 existing ospf processes - the limit is 4. These existing processes are for various vrf contexts we have. I see you can run multiple vrf contexts under one process - but how does that work in a mixed environment where the ospf neighbours are still ios 6500s? They still expect to see different ospf process id per vrf.

We have a choice to move some routing to a different protocol - or any suggestions?

  • LAN Switching and Routing
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Nexus OSPF process limit

OSPF process ID is only local significant. You can estabilish OSPF adjancy with your neighbor running different OSPF process ID. This works in IOS and it should work under NX-OS also.

Rack1SW3#sh ip ospf nei

Neighbor ID     Pri   State           Dead Time   Address         Interface

4.4.4.4           1   FULL/BDR        00:00:38    155.34.34.4     FastEthernet0/21

Rack1SW3#sh ip ospf int

FastEthernet0/21 is up, line protocol is up (connected)

  Internet Address 155.34.34.3/24, Area 100

  Process ID 200, Router ID 3.3.3.3, Network Type BROADCAST, Cost: 1

  Transmit Delay is 1 sec, State DR, Priority 1

  Designated Router (ID) 3.3.3.3, Interface address 155.34.34.3

  Backup Designated router (ID) 4.4.4.4, Interface address 155.34.34.4

  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

  Index 1/1, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 0, maximum is 1

  Last flood scan time is 0 msec, maximum is 0 msec

  Neighbor Count is 1, Adjacent neighbor count is 1

    Adjacent with neighbor 4.4.4.4  (Backup Designated Router)

  Suppress hello for 0 neighbor(s)

Rack1SW4#sh ip ospf nei

Neighbor ID     Pri   State           Dead Time   Address         Interface

3.3.3.3           1   FULL/DR         00:00:30    155.34.34.3     FastEthernet0/21

Rack1SW4#sh ip ospf int

FastEthernet0/21 is up, line protocol is up (connected)

  Internet Address 155.34.34.4/24, Area 100

  Process ID 100, Router ID 4.4.4.4, Network Type BROADCAST, Cost: 1

  Transmit Delay is 1 sec, State BDR, Priority 1

  Designated Router (ID) 3.3.3.3, Interface address 155.34.34.3

  Backup Designated router (ID) 4.4.4.4, Interface address 155.34.34.4

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

    Hello due in 00:00:09

  Supports Link-local Signaling (LLS)

  Cisco NSF helper support enabled

  IETF NSF helper support enabled

  Index 1/1, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 1, maximum is 1

  Last flood scan time is 0 msec, maximum is 4 msec

  Neighbor Count is 1, Adjacent neighbor count is 1

    Adjacent with neighbor 3.3.3.3  (Designated Router)

  Suppress hello for 0 neighbor(s)

HTH,

jerry

2 REPLIES
Cisco Employee

Re: Nexus OSPF process limit

OSPF process ID is only local significant. You can estabilish OSPF adjancy with your neighbor running different OSPF process ID. This works in IOS and it should work under NX-OS also.

Rack1SW3#sh ip ospf nei

Neighbor ID     Pri   State           Dead Time   Address         Interface

4.4.4.4           1   FULL/BDR        00:00:38    155.34.34.4     FastEthernet0/21

Rack1SW3#sh ip ospf int

FastEthernet0/21 is up, line protocol is up (connected)

  Internet Address 155.34.34.3/24, Area 100

  Process ID 200, Router ID 3.3.3.3, Network Type BROADCAST, Cost: 1

  Transmit Delay is 1 sec, State DR, Priority 1

  Designated Router (ID) 3.3.3.3, Interface address 155.34.34.3

  Backup Designated router (ID) 4.4.4.4, Interface address 155.34.34.4

  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

  Index 1/1, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 0, maximum is 1

  Last flood scan time is 0 msec, maximum is 0 msec

  Neighbor Count is 1, Adjacent neighbor count is 1

    Adjacent with neighbor 4.4.4.4  (Backup Designated Router)

  Suppress hello for 0 neighbor(s)

Rack1SW4#sh ip ospf nei

Neighbor ID     Pri   State           Dead Time   Address         Interface

3.3.3.3           1   FULL/DR         00:00:30    155.34.34.3     FastEthernet0/21

Rack1SW4#sh ip ospf int

FastEthernet0/21 is up, line protocol is up (connected)

  Internet Address 155.34.34.4/24, Area 100

  Process ID 100, Router ID 4.4.4.4, Network Type BROADCAST, Cost: 1

  Transmit Delay is 1 sec, State BDR, Priority 1

  Designated Router (ID) 3.3.3.3, Interface address 155.34.34.3

  Backup Designated router (ID) 4.4.4.4, Interface address 155.34.34.4

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

    Hello due in 00:00:09

  Supports Link-local Signaling (LLS)

  Cisco NSF helper support enabled

  IETF NSF helper support enabled

  Index 1/1, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 1, maximum is 1

  Last flood scan time is 0 msec, maximum is 4 msec

  Neighbor Count is 1, Adjacent neighbor count is 1

    Adjacent with neighbor 3.3.3.3  (Designated Router)

  Suppress hello for 0 neighbor(s)

HTH,

jerry

New Member

Nexus OSPF process limit

Indeed - so worried about differences I am forgetting first principles. Confrimed OK.

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