show ip ospf border-routers

[daniel.tanch]

R2#sh ip ospf border-routers

OSPF Process 1 internal Routing Table

Codes: i - Intra-area route, I - Inter-area route

I 192.16.11.1 [11] via 192.16.12.2, Ethernet2/0, ASBR, Area 2, SPF 3

i 192.16.12.2 [10] via 192.16.12.2, Ethernet2/0, ABR, Area 2, SPF 3

What does the SPF 3 means for this case? 

According to Cisco website it state "The internal number of the shortest path first (SPF) calculation that installs this route." But I don't quite understand what it mean by the internal number of SPF? 

http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf.html#wp1019030 

[Rolf Fischer · Accepted solution]

Daniel,

I believe it refers to the most recent SPF run, which (re-)calculated the path to the respective border-router(s).

"Internal" because every area runs its own SPFs, the command output also showes the area ID from which the path is learned.

Example:

R2#show ip ospf border-routers
OSPF Process 1 internal Routing Table
Codes: i - Intra-area route, I - Inter-area route
i 1.1.1.1 [64] via 172.16.12.1, Serial0/0, ABR, Area 0, SPF 2

R2#show ip ospf statistics detail
            OSPF Router with ID (2.2.2.2) (Process ID 1)
  Area 0: SPF algorithm executed 2 times
SPF 1 executed 00:02:46 ago, SPF type Full
  SPF calculation time (in msec):
  SPT    Intra  D-Intr Summ   D-Summ Ext7   D-Ext7 Total
  4      8      0      0      0      0      0      8
  LSIDs processed R:2 N:0 Stub:5 SN:0 SA:0 X7:0
  Change record
  LSIDs changed 3
  Changed LSAs. Recorded is LS ID and LS type:
  1.1.1.1(R) 2.2.2.2(R) 1.1.1.1(R)
SPF 2 executed 00:02:20 ago, SPF type Full
  SPF calculation time (in msec):
  SPT    Intra  D-Intr Summ   D-Summ Ext7   D-Ext7 Total
  0      4      0      0      0      0      0      4
  LSIDs processed R:2 N:0 Stub:5 SN:0 SA:0 X7:0
  Change record
  LSIDs changed 1
  Changed LSAs. Recorded is LS ID and LS type:
  1.1.1.1(R)

HTH

Rolf

[Masoud Pourshabanian]

I think it is just the internal number of SPF calculations. How many SPF calculations were done to install that route.

Please take look at link below. See the table of explanation of "show ip ospf border-routers"

https://books.google.com/books?id=IeLKKXzaXFAC&pg=PR16&dq=show+ip+ospf+border-router&hl=en&sa=X&ved=0CCoQ6AEwAWoVChMInKSjlr6_yAIVBZANCh2FLQXv#v=onepage&q=show%20ip%20ospf%20border-router&f=false