10G Core Routing Switch User Manual
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Routing protocol or route type
The preference of the corresponding route
DIRECT
0
OSPF
10
STATIC
60
RIP
100
UNKNOWN
255
In the table, 0 indicates a direct route. 255 Indicates any route from unreliable source. Except for direct routing, 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.
7.2.2.
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.
II. Route backup
Route backup: Support route backup. When main route is in failure, the system will automatically switch to a backup
route to improve the network reliability.In order to achieve route backup, the user can configure multiple routes to the
same destination according to actual situation. One of the routes has the highest precedence and is called as main
route. The other routes have descending precedences and are called as backup routes. Normally, the router sends data
via main route. When the line is in failure, the main route will hide itself and the router will choose one from the left
routes as a backup route whose precedence is higher than others’ to send data. In this way, the switchover from the
main route to the backup route is realized. When the main route recovers, the router will restore it and re-select route.
As the main route has the highest precedence, the router will choose the main route to send data. This process is the
automatic switchover from the backup route to the main route.
7.2.3.
Routes Shared between Routing Protocols
As the algorithms of various routing protocols are different, different protocols may generate different routes, thus
bringing about the problem of how to resolve the differences when different routes are generated by different routing
protocols. The SPEED series switches can import the information of another routing protocol.Each protocol has its own
route redistribution mechanism.
