OSPFv3

ospf6d is a daemon support OSPF version 3 for IPv6 network. OSPF for IPv6 is described in RFC 2740.

OSPF6 router

router ospf6 [vrf NAME]
ospf6 router-id A.B.C.D

Set router’s Router-ID.

interface IFNAME area (0-4294967295)
interface IFNAME area A.B.C.D

Bind interface to specified area, and start sending OSPF packets. area can be specified as 0.

timers throttle spf (0-600000) (0-600000) (0-600000)

This command sets the initial delay, the initial-holdtime and the maximum-holdtime between when SPF is calculated and the event which triggered the calculation. The times are specified in milliseconds and must be in the range of 0 to 600000 milliseconds.

The delay specifies the minimum amount of time to delay SPF calculation (hence it affects how long SPF calculation is delayed after an event which occurs outside of the holdtime of any previous SPF calculation, and also serves as a minimum holdtime).

Consecutive SPF calculations will always be separated by at least ‘hold-time’ milliseconds. The hold-time is adaptive and initially is set to the initial-holdtime configured with the above command. Events which occur within the holdtime of the previous SPF calculation will cause the holdtime to be increased by initial-holdtime, bounded by the maximum-holdtime configured with this command. If the adaptive hold-time elapses without any SPF-triggering event occurring then the current holdtime is reset to the initial-holdtime.

router ospf6
 timers throttle spf 200 400 10000

In this example, the delay is set to 200ms, the initial holdtime is set to 400ms and the maximum holdtime to 10s. Hence there will always be at least 200ms between an event which requires SPF calculation and the actual SPF calculation. Further consecutive SPF calculations will always be separated by between 400ms to 10s, the hold-time increasing by 400ms each time an SPF-triggering event occurs within the hold-time of the previous SPF calculation.

auto-cost reference-bandwidth COST

This sets the reference bandwidth for cost calculations, where this bandwidth is considered equivalent to an OSPF cost of 1, specified in Mbits/s. The default is 100Mbit/s (i.e. a link of bandwidth 100Mbit/s or higher will have a cost of 1. Cost of lower bandwidth links will be scaled with reference to this cost).

This configuration setting MUST be consistent across all routers within the OSPF domain.

maximum-paths (1-64)

Use this command to control the maximum number of parallel routes that OSPFv3 can support. The default is 64.

OSPF6 area

Area support for OSPFv3 is not yet implemented.

OSPF6 interface

ipv6 ospf6 cost COST

Sets interface’s output cost. Default value depends on the interface bandwidth and on the auto-cost reference bandwidth.

ipv6 ospf6 hello-interval HELLOINTERVAL

Sets interface’s Hello Interval. Default 10

ipv6 ospf6 dead-interval DEADINTERVAL

Sets interface’s Router Dead Interval. Default value is 40.

ipv6 ospf6 retransmit-interval RETRANSMITINTERVAL

Sets interface’s Rxmt Interval. Default value is 5.

ipv6 ospf6 priority PRIORITY

Sets interface’s Router Priority. Default value is 1.

ipv6 ospf6 transmit-delay TRANSMITDELAY

Sets interface’s Inf-Trans-Delay. Default value is 1.

ipv6 ospf6 network (broadcast|point-to-point)

Set explicitly network type for specified interface.

OSPF6 route-map

Usage of ospfd6’s route-map support.

set metric [+|-](0-4294967295)

Set a metric for matched route when sending announcement. Use plus (+) sign to add a metric value to an existing metric. Use minus (-) sign to substract a metric value from an existing metric.

Redistribute routes to OSPF6

redistribute <babel|bgp|connected|isis|kernel|openfabric|ripng|sharp|static|table> [route-map WORD]

Redistribute routes from other protocols into OSPFv3.

default-information originate [{always|metric (0-16777214)|metric-type (1-2)|route-map WORD}]

The command injects default route in the connected areas. The always argument injects the default route regardless of it being present in the router. Metric values and route-map can also be specified optionally.

Showing OSPF6 information

show ipv6 ospf6 [vrf <NAME|all>] [json]

Show information on a variety of general OSPFv3 and area state and configuration information. JSON output can be obtained by appending ‘json’ to the end of command.

show ipv6 ospf6 [vrf <NAME|all>] database [<detail|dump|internal>] [json]

This command shows LSAs present in the LSDB. There are three view options. These options helps in viewing all the parameters of the LSAs. JSON output can be obtained by appending ‘json’ to the end of command. JSON option is not applicable with ‘dump’ option.

show ipv6 ospf6 [vrf <NAME|all>] database <router|network|inter-prefix|inter-router|as-external|group-membership|type-7|link|intra-prefix> [json]

These options filters out the LSA based on its type. The three views options works here as well. JSON output can be obtained by appending ‘json’ to the end of command.

show ipv6 ospf6 [vrf <NAME|all>] database adv-router A.B.C.D linkstate-id A.B.C.D [json]

The LSAs additinally can also be filtered with the linkstate-id and advertising-router fields. We can use the LSA type filter and views with this command as well and visa-versa. JSON output can be obtained by appending ‘json’ to the end of command.

show ipv6 ospf6 [vrf <NAME|all>] database self-originated [json]

This command is used to filter the LSAs which are originated by the present router. All the other filters are applicable here as well.

show ipv6 ospf6 [vrf <NAME|all>] interface [json]

To see OSPF interface configuration like costs. JSON output can be obtained by appending “json” in the end.

show ipv6 ospf6 [vrf <NAME|all>] neighbor [json]

Shows state and chosen (Backup) DR of neighbor. JSON output can be obtained by appending ‘json’ at the end.

show ipv6 ospf6 [vrf <NAME|all>] interface traffic [json]

Shows counts of different packets that have been recieved and transmitted by the interfaces. JSON output can be obtained by appending “json” at the end.

show ipv6 route ospf6

This command shows internal routing table.

show ipv6 ospf6 zebra [json]

Shows state about what is being redistributed between zebra and OSPF6. JSON output can be obtained by appending “json” at the end.

show ipv6 ospf6 [vrf <NAME|all>] redistribute [json]

Shows the routes which are redistributed by the router. JSON output can be obtained by appending ‘json’ at the end.

show ipv6 ospf6 [vrf <NAME|all>] route [<intra-area|inter-area|external-1|external-2|X:X::X:X|X:X::X:X/M|detail|summary>] [json]

This command displays the ospfv3 routing table as determined by the most recent SPF calculations. Options are provided to view the different types of routes. Other than the standard view there are two other options, detail and summary. JSON output can be obtained by appending ‘json’ to the end of command.

show ipv6 ospf6 [vrf <NAME|all>] route X:X::X:X/M match [detail] [json]

The additional match option will match the given address to the destination of the routes, and return the result accordingly.

show ipv6 ospf6 [vrf <NAME|all>] interface [IFNAME] prefix [detail|<X:X::X:X|X:X::X:X/M> [<match|detail>]] [json]

This command shows the prefixes present in the interface routing table. Interface name can also be given. JSON output can be obtained by appending ‘json’ to the end of command.

show ipv6 ospf6 [vrf <NAME|all>] spf tree [json]

This commands shows the spf tree from the recent spf calculation with the calling router as the root. If json is appended in the end, we can get the tree in JSON format. Each area that the router belongs to has it’s own JSON object, with each router having “cost”, “isLeafNode” and “children” as arguments.

Sample configuration

Example of ospf6d configured on one interface and area:

interface eth0
 ipv6 ospf6 instance-id 0
!
router ospf6
 ospf6 router-id 212.17.55.53
 area 0.0.0.0 range 2001:770:105:2::/64
 interface eth0 area 0.0.0.0
!

Larger example with policy and various options set:

debug ospf6 neighbor state
!
interface fxp0
 ipv6 ospf6 cost 1
 ipv6 ospf6 hello-interval 10
 ipv6 ospf6 dead-interval 40
 ipv6 ospf6 retransmit-interval 5
 ipv6 ospf6 priority 0
 ipv6 ospf6 transmit-delay 1
 ipv6 ospf6 instance-id 0
!
interface lo0
 ipv6 ospf6 cost 1
 ipv6 ospf6 hello-interval 10
 ipv6 ospf6 dead-interval 40
 ipv6 ospf6 retransmit-interval 5
 ipv6 ospf6 priority 1
 ipv6 ospf6 transmit-delay 1
 ipv6 ospf6 instance-id 0
!
router ospf6
 router-id 255.1.1.1
 redistribute static route-map static-ospf6
 interface fxp0 area 0.0.0.0
!
access-list access4 permit 127.0.0.1/32
!
ipv6 access-list access6 permit 3ffe:501::/32
ipv6 access-list access6 permit 2001:200::/48
ipv6 access-list access6 permit ::1/128
!
ipv6 prefix-list test-prefix seq 1000 deny any
!
route-map static-ospf6 permit 10
 match ipv6 address prefix-list test-prefix
 set metric-type type-2
 set metric 2000
!
line vty
 access-class access4
 ipv6 access-class access6
 exec-timeout 0 0
!