01-12-2012 05:07 PM - edited 03-07-2019 04:19 AM
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?
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01-12-2012 07:22 PM
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
01-12-2012 07:22 PM
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
01-15-2012 10:09 PM
Indeed - so worried about differences I am forgetting first principles. Confrimed OK.
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