Routing OSPF - NX-OS

[kitkat0981]

Hi all,

figured I would ask here since im no Cisco routing engineer especially with Nexus and NX-OS.

so seeing some weird things in OSPF more so for what seems to be discrepancies between 2 HSRP 5548's running OSPF.

OSPF summary is not identical.

SW1: 

SW1# show ip ospf route summary 
 OSPF Process ID 100 VRF default, Routing Table
  (D) denotes route is directly attached      (R) denotes route is in RIB
  (NHR) denotes next-hop is in RIB

Total number of routes: 244
Total number of paths: 234

Total number of (routes, paths) per path type:
nopath          : (      10,        0)
intra           : (     114,      114)
discard-internal: (       0,        0)
inter           : (       0,        0)
discard-external: (       0,        0)
type-1          : (       0,        0)
nssa type-1     : (       0,        0)
type-2          : (     120,      120)
nssa type-2     : (       0,        0)

Number of (routes,paths) per mask-length:
  /0 : (       1,        0)  /16: (      12,        6)
  /17: (       1,        0)  /20: (       1,        1)
  /21: (      19,       19)  /23: (       1,        1)
  /24: (      59,       57)  /28: (       1,        1)
  /29: (       9,        9)  /30: (      10,       10)
  /32: (     130,      130)

SW2:

SW2# show ip ospf route summary
 OSPF Process ID 100 VRF default, Routing Table
  (D) denotes route is directly attached      (R) denotes route is in RIB
  (NHR) denotes next-hop is in RIB

Total number of routes: 244
Total number of paths: 244

Total number of (routes, paths) per path type:
nopath          : (       0,        0)
intra           : (     114,      114)
discard-internal: (       0,        0)
inter           : (       0,        0)
discard-external: (       0,        0)
type-1          : (       0,        0)
nssa type-1     : (       0,        0)
type-2          : (     130,      130)
nssa type-2     : (       0,        0)

Number of (routes,paths) per mask-length:
  /0 : (       1,        1)  /16: (      12,       12)
  /17: (       1,        1)  /20: (       1,        1)
  /21: (      19,       19)  /23: (       1,        1)
  /24: (      59,       59)  /28: (       1,        1)
  /29: (       9,        9)  /30: (      10,       10)
  /32: (     130,      130)

also, i read in other sections of this forum that some stated you should not use HSRP virtual IP's as next hop addresses in OSPF and when adding Static route for OSPF advertisement. Is this correct?  if so, what would be the potential issues, weirdness seen?

thanks

np

[MHM Cisco World]

/16 and /24 

what this subnet ?

[kitkat0981]

ya so /16's   there is 12 routes and 12 paths on SW2 but only 12 routes and 6 paths in SW1 .... i dont understand why.

[kubn2]

Check ospf DB and try to spot which routes have problems

[MHM Cisco World]

can I see topology ?

[Georg Pauwen]

Hello,

on a side note, it used to be that an HSRP virtual address used as a static neighbor IP address would not form an OSPF adjacency. Not sure if that still is the case (in NX-OS)...

[kitkat0981]

i cannot put any configs since work wont allow it.

Ill see if i can do up a diagram.

[kitkat0981]

ok so I have created a lab and i cant seem to get OSPF to start. See diagram and attached commands.

The backbone area says inactive and not sure why.

This is nx-os latest virl.

Capture22.png is the diagram, others are command outputs.

[kitkat0981]

anyone know why my OSPF is not initializing?  Am I missing a configuration? Im doing this in EVE-NG and putting a standard router at the place of the NX-OS 7000 seems to work...  any help would be appreciated.