Load Sharing; Route Backup; Route Recursion; Route Redistribution - HPE FlexNetwork HSR6800 Configuration Manual

Routing type
IS-IS
Static route
RIP
OSPF ASE
OSPF NSSA
IBGP
EBGP
Unknown (route from an untrusted source)

Load sharing

A routing protocol might find multiple optimal equal-cost routes to the same destination. You can use
these routes to implement equal-cost multi-path (ECMP) load sharing.
Static routing, IPv6 static routing, RIP/RIPng, OSPF/OSPFv3, BGP/IPv6 BGP, and IS-IS/IPv6 IS-IS
support ECMP load sharing.

Route backup

Route backup can improve network availability. Among multiple routes to the same destination, the
route with the highest priority is the main route and others are backup routes.
The router forwards matching packets through the main route. When the main route fails, the route
with the highest preference among the backup routes is selected to forward packets. When the main
route recovers, the router uses it to forward packets.

Route recursion

To use a BGP, static, or RIP route that has an indirectly-connected next hop, a router must perform
route recursion to find the outgoing interface to reach the next hop.
Link-state routing protocols, such as OSPF and IS-IS, do not need route recursion, because they
obtain directly-connected next hops through route calculation.

Route redistribution

Route redistribution enables routing protocols to learn route information from each other. A dynamic
routing protocol can redistribute routes from other routing protocols including direct and static routing.
For more information, see the respective chapters on those routing protocols in this configuration
guide.

Displaying and maintaining a routing table

Preference
15
60
100
150
150
255
255
256
3