area
Configures various parameters, including authentication, area identification, virtual link ID, and delay/interval values for the specified OSPF area using a specific VRF instance.
Product
PDSN
HA
GGSN
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > Context Configuration > OSPF Configuration > OSPF VRF Configuration
configure > context context_name > router ospf > ip vrf vrf_name
Entering the above command sequence results in the following prompt:
[local]host_name(config-ospf-vrf)#
Syntax
[no] area { decimal_value | ip_address } {authentication [ message-digest ] | default-cost cost_value | nssa [default-information-originate] [no-redistribution] [no-summary] [translate-always] [translate-candidate] [translate-never] | stub [no-summary] | virtual-link router_ip_address [authentication {message-digest | null | text}| authentication-key {encrypted password encrypted_string | password password_string}| message-digest-key key_id md5 [encrypted password encrypted_string | password password_string]} [dead-interval] [hello-interval] [retransmit-interval] [transmit-delay]
no
Disables or removes configured parameters for the specified OSPF area using a specific VRF instance.
ip_address
Specifies the IP address of the area where authentication will be enabled in IPv4 dotted-decimal notation.
decimal_value
Specifies the identification number of the area where parameters to be configured as an integer from 0 through 4294967295.
authentication
Sets the OSPF authentication type to use the simple authentication method.
message-digest
Sets the OSPF authentication type to use the message digest 5 (MD5) authentication method.
default-cost cost_value
Sets the default cost for an OSPF area. cost_value must be an integer from 0 through 16777215.
nssa [default-information-originate] [no-redistribution no-summary] [translate-always] [translate-candidate] [translate-never]
Configures and defines an area as an NSSA (Not So Stubby Area) and configures OSPF parameters for it.
default-information-originate : Configures the OSPF VRF instances to originate default information to the NSSA area.
no-redistribution : Configures the OSPF VRF instance to not to redistribute external routes to the NSSA area.
no-summary : Configures the OSPF VRF instance to not to inject the inter-area routes into NSSA.
translate-always : Configures the NSSA-ABR (Area Border Router) always to translate. By default this is disabled.
translate-candidate : Configures the NSSA-ABR always to translate election. By default this is enabled.
translate-never : Configures the NSSA-ABR never to translate. By default this is disabled.
stub [no-summary]
Specifies an OSPF area as an stub area configures the NSSA-ABR never to translate. By default this is disabled.
no-summary : Disables (stops) the ABR from sending summary LSAs into the stub area.
virtual-link router_id
Specifies the router identifier which provides a virtual link between an area that cannot be physically connected to the network backbone and an area that is physically connected to the network backbone.
router_id must be an IP address in IPv4 dotted-decimal notation of the ABR to be linked to.
authentication {message-digest | null | text}
Configures the OSPF authentication method to be used by the virtual link between an area that cannot be physically connected to the network backbone and an area that is physically connected to the network backbone.
message-digest: Set the OSPF authentication type to use the message digest (MD) authentication method.
null: Set the OSPF authentication type to use no authentication, thus disabling either MD or clear text methods.
text: Set the OSPF authentication type to use the clear text authentication method.
authentication-key
Configures the authentication password for the virtual link between an area that cannot be physically connected to the network backbone and an area that is physically connected to the network backbone.
message-digest-key key_id
Specifies the MD key identifier number for virtual link connection. key_id must be an integer from 1 through 255.
md5
Sets the message digest to MD5 for virtual link connection.
[encrypted] password passwd_string
Specifies the password required for virtual link connection authentications. The keyword password is optional and if specified passwd_string must be an alphanumeric string of 1 through 63 characters. The password specified must be in an encrypted format if the optional keyword encrypted was specified.
The encrypted keyword is intended only for use by the system while saving configuration scripts. The system displays the encrypted keyword in the configuration file as a flag that the variable following the password keyword is the encrypted version of the plain text password. Only the encrypted password is saved as part of the configuration file. encrypted_string is an alphanumeric string of 1 through 523 characters.
dead-interval value
Specifies the dead interval (in seconds) that the router should wait, during which time no packets are received and after the router considers a neighboring router to be off-line. value must be an integer from 1 through 65535.
hello-interval value
Specifies the hello interval (in seconds) before sending a hello packet. value must be an integer from 1 through 65535.
retransmit-interval value
Specifies the delay between retransmission (in seconds) that router should wait before retransmitting a packet. value must be an integer from 1 through 3600.
transmit-delay value
Specifies the interval (in seconds) that the router should wait before transmitting a packet. value must be an integer from 1 through 3600.
Usage Guidelines
Use this command to configure/set the various network/connection/authentication parameters of OPSF areas using specific VRF instance.
Examples
area 192.168.100.10 authentication message-digest
area 192.168.100.10 nssa
area 192.168.100.10 stub
area 192.168.100.10 virtual-link 192.168.200.20
area 192.168.100.10 virtual-link 192.168.200.20 null
area 192.168.100.10 virtual-link 192.168.200.20 authentication-key password 123456
area 192.168.100.10 virtual-link 192.168.200.20 message-digest-key 25 md5 password 123456
area 192.168.100.10 virtual-link 192.168.200.20 retransmit-interval 60