Huawei Quidway S6500 Series Operation Manual page 146

Operation Manual - Routing Protocol
Quidway S6500 Series Ethernet Switches
Table 1-1 Routing protocols and the default preferences for the routes learned by them
Routing protocol or route type
DIRECT
OSPF
IS-IS
STATIC
RIP
OSPF ASE
OSPF NSSA
IBGP
EBGP
UNKNOWN
In the table, 0 indicates a direct route. 255 indicates any route from unreliable source.
Except for direct routing and BGP (IBGP and EBGP), the preferences of various
dynamic routing protocols can be manually configured to meet the user requirements.
In addition, the preferences for individual static routes can be different.
1.2.2 Supporting Load Sharing and Route Backup
I. Load sharing
Load sharing: Support multi-route mode, permitting to configure multiple routes that
reach the same destination and use the same precedence. The same destination can
be reached via multiple different paths, whose precedences are equal. When there is
no route that can reach the same destination with a higher precedence, the multiple
routes will be adopted by IP, which will forward the packets to the destination via these
paths so as to implement load sharing.
For the same destination, a specified routing protocol may find multiple different routes.
If the routing protocol has the highest precedence among all active routing protocols,
these multiple routes will be regarded as currently valid routes. Thus, load sharing of IP
traffic is ensured in terms of routing protocols.
By far, Salience III Series switching engines support four routes to implement load
sharing.
The preference of the corresponding route
0
10
15
60
100
150
150
256
256
255
Huawei Technologies Proprietary
1-5
Chapter 1 IP Routing Protocol Overview