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"external-out enable" OSPF Command - IOS XR

Introduction:

 

The "external-out enable" command is available for configuration under the "router ospf process" in case of the IOS-XR operating system. This command basically enables advertisement of intra-area routes on the device as external routes in the OSPF domain.

 

Configuration Example:

 

RP/0/RP0/CPU0:CORE#

router ospf 1
 area 0
  external-out enable
  interface TenGigE0/7/0/15
   cost 10
  !
  interface TenGigE0/7/0/16
   cost 10
  !
  interface TenGigE0/7/0/17
   cost 10
  !
 !
!
end

 

RP/0/RP0/CPU0:CORE#sh ospf database external self-originate  | in State ID

  Link State ID: 10.56.232.0 (External Network Number)
  Link State ID: 10.56.232.32 (External Network Number)
  Link State ID: 10.56.232.64 (External Network Number)
  Link State ID: 10.56.232.68 (External Network Number)
  Link State ID: 10.56.232.72 (External Network Number)
  Link State ID: 10.56.232.96 (External Network Number)
  Link State ID: 10.56.232.100 (External Network Number)
  Link State ID: 10.56.232.104 (External Network Number)
  Link State ID: 10.56.233.12 (External Network Number)
  Link State ID: 10.56.233.16 (External Network Number)
  Link State ID: 10.56.233.20 (External Network Number)

 


Alcatel PE# show router ospf database ext type external

===============================================================================
OSPF Link State Database (Type : External)
===============================================================================
Type    Area Id         Link State Id   Adv Rtr Id      Age  Sequence   Cksum  
-------------------------------------------------------------------------------

AS Ext  n/a             10.56.232.0     10.162.0.3      460  0x80000011 0x59fd
AS Ext  n/a             10.56.232.32    10.162.0.3      460  0x80000012 0x7ab1
AS Ext  n/a             10.56.232.64    10.162.0.3      460  0x80000011 0xd640
AS Ext  n/a             10.56.232.68    10.162.0.3      460  0x80000011 0xae64
AS Ext  n/a             10.56.232.72    10.162.0.3      460  0x80000011 0x8688
AS Ext  n/a             10.56.232.96    10.162.0.3      460  0x80000011 0xf9f2
AS Ext  n/a             10.56.232.100   10.162.0.3      460  0x80000011 0xd117
AS Ext  n/a             10.56.232.104   10.162.0.3      460  0x80000011 0xa93b
AS Ext  n/a             10.56.233.12    10.162.0.3      460  0x80000011 0xa194
AS Ext  n/a             10.56.233.16    10.162.0.3      460  0x80000011 0x79b8
AS Ext  n/a             10.56.233.20    10.162.0.3      460  0x80000011 0x51dc

 

Caution:

 

The "external-out enable" OSPF command should not be turned on without appropriate network planning.

 

Also it is important to note that the router takes "external-out" command without "enable" keyword under "router ospf". An operator can mistakenly type "ext" instead of “exit” to exit "router ospf config mode" and this can have the “external-out” command configured under "router ospf" unintentionally.

 

RP/0/RP0/CPU0:CORE#config
RP/0/RP0/CPU0:CORE(config)#router ospf 1
RP/0/RP0/CPU0:CORE(config-ospf)#external-out ?
  disable  Disable advertisement of intra-area routes as external
  enable   Enable advertisement of intra-area routes as external
  <cr>
RP/0/RP0/CPU0:CORE(config-ospf)#ext
RP/0/RP0/CPU0:CORE(config-ospf)#show
router ospf 1
 external-out enable
!

 

 

Comments
New Member

Link State ID: 10.56.232.0 (External Network Number) but for this command do I need to enter the voip number of the internal network? thank you

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