Dynamic Routing Protocols - HP MSR2000 series Configuration Manual

Static routes are easy to configure and require less system resources. They work well in small and stable
networks. In networks where topology changes may occur frequently, using a dynamic routing protocol
is better.
To display brief information about a routing table, use the display ip routing-table command:
<Sysname> display ip routing-table
Routing Tables: Public
Destinations : 7
Destination/Mask
1.1.1.0/24
2.2.2.0/24
80.1.1.0/24
...
A route entry includes the following key items:
• Destination—IP address of the destination host or network.
Mask—Mask length of the IP address.
•
Pre—Preference of the route. Among routes to the same destination, the one with the highest
•
preference is optimal.
• Cost—If multiple routes to a destination have the same preference, the one with the smallest cost is
the optimal route.
NextHop—Next hop.
•
Interface—Output interface.
•

Dynamic routing protocols

Dynamic routing protocols dynamically collect and report reachability information to adapt to topology
changes. They are suitable for large networks.
Compared with static routing, dynamic routing protocols require more resources, and are complicated to
configure.
Dynamic routing protocols can be classified based on different criteria, as shown in
Table 2 Dynamic routing protocols
Criterion
Optional scope
Routing algorithm
Destination address
type
IP version
Routes : 7
Proto Pre Cost
Direct 0 0
Static 60 0
OSPF 10 2
Categories
•
Interior gateway protocols (IGPs)—Work within an AS. Examples include RIP, OSPF,
and IS-IS.
•
Exterior gateway protocols (EGPs)—Work between ASs. The most popular one is
BGP.
•
Distance-vector protocols—RIP and BGP. BGP is also considered a path-vector
protocol.
•
Link-state protocols—OSPF and IS-IS.
•
Unicast routing protocols—RIP, OSPF, BGP, and IS-IS.
•
Multicast routing protocols—PIM-SM and PIM-DM.
•
IPv4 routing protocols—RIP, OSPF, BGP, and IS-IS.
•
IPv6 routing protocols—RIPng, OSPFv3, IPv6 BGP, and IPv6 IS-IS.
2
NextHop Interface
1.1.1.1 Vlan11
12.2.2.2 Vlan12
80.1.1.1 Vlan13
Table 2: