routeprotocol

In order for an organisation to connect to the rest of the internet directly; it must obtain a public Autonomous System Number, or AS Number. AS Numbers originally were up to 16-bits in length, but were expanded through RFC 4893 to allow up to 32-bits in length due to AS Number exhaustion. This increased the…

In BGP, a group of routers under a single organisations control is usually housed within a single autonomous system (AS) number, with optionally a number of other interior gateway protocols within that domain to route packets within that group of routers. BGP can be used as the only interior gateway protocol as well as the…

OSPFv3 can support multiple address families, including IPv4. To enable OSPFv3 for IPv4, ensure that the interface being used has a IPv6 address configured, it does not need to be a global address and can be a link-local one. The OSPF process for IPv4 can then be enabled with the command ospfv3 X ipv4 area…

OSPFv3 supports the same network types as the original version of OSPF. The network type can be changed in interface configuaration mode with the commands ospfv3 network point-to-point or broadcast

Similar to OSPF and IPv4 networks, OSPFv3 has the capability to summarise IPv6 networks too. To summarise an IPv6 network, use the following commands: router ospfv3 1 address-family ipv6 unicast area 0 range 2001:ab1:0:0::/65

Like OSPFv2, OSPFv3 has the ability to set an interface as passive. There are two modes in that passive-interface can be used, one will blacklist certain interfaces that are specified. The other will blacklist all interfaces by default and only interfaces that are explicitly specified will be whitelisted to participate in the OSPF process. To…

Viewing the OSPFv3 statistics and settings use very similar commands to those in OSPFv2 – most commands just need the ip ospf replaced with ospfv3 ipv6 To view neighbour adjacencies on OSPFv3, enter the command show ospfv3 ipv6 neighbor To view interface statistics in OSPFv3, use the command show ospfv3 interface followed by the interface…

To configure OSPFv3 on a Cisco device, IPv6 must be enabled on the router. This can be switched on with the global configuration command ipv6 unicast-routing Once IPv6 is enabled on the router, OSPFv3 router configuration mode can be entered with the command router ospfv3 followed by the chosen process ID. A router ID is…

Type Packet Name Source Destination Purpose 1 Hello Link-local address FF02:55 Discover and maintain neighbours 1 Hello Link-local address Link-local address Initial forming of adjacency and immediate hello 2 Database Description Link-local address Link-local address Summarise database contents 3 Link state request Link-local address Link-local address Requesting information from a database 4 Link-state update Link-local…