http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094820.shtml
You can usually use the
show ip route
command to find equal cost routes. For example, below is the
show ip route
command output to a particular subnet that has multiple routes. Notice there are two routing descriptor blocks. Each block is one route
There is also an asterisk (*) next to one of the block entries. This corresponds to the active route that is used for new traffic. The term 'new traffic' corresponds to a single packet or an entire flow to a destination, depending on the type of switching configured.
For process-switching—load balancing is on a per-packet basis and the asterisk (*) points to the interface over which the next packet is sent.
For fast-switching—load balancing is on a per-destination basis and the asterisk (*) points to the interface over which the next destination-based flow is sent.
The position of the asterisk (*) keeps rotating among the equal cost paths each time a packet/flow is served.
M2515-B# show ip route 1.0.0.0
Routing entry for 1.0.0.0/8
Known via "rip", distance 120, metric 1
Redistributing via rip
Advertised by rip (self originated)
Last update from 192.168.75.7 on Serial1, 00:00:00 ago
Routing Descriptor Blocks:
* 192.168.57.7, from 192.168.57.7, 00:00:18 ago, via Serial0
Route metric is 1, traffic share count is 1
192.168.75.7, from 192.168.75.7, 00:00:00 ago, via Serial1
Route metric is 1, traffic share count is 1
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