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.
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
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 !
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