Verifying The Routing Table Entries For Parallel Links - Cisco CRS-1 - Carrier Routing System Router Troubleshooting Manual

Troubleshooting Layer 3 or Layer 4 Load Balancing

Verifying the Routing Table Entries for Parallel Links

Cisco Express Forwarding uses the path information in the IP routing table to balance traffic over
multiple links. For this reason, verifying correct load balancing with Cisco Express Forwarding begins
with confirming the contents of the IP routing table.
Note Unlike configuration procedures, troubleshooting is not a deterministic process. This section provides a
typical procedure for troubleshooting load balancing when OPSF is the IGP. For a example of this
procedure, see
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
DETAILED STEPS
Command or Action
Step 1
show route destination-address
Example:
RP/0/RP0/CPU0:Router# show route 10.1.2.1
Step 2
configure
Example:
RP/0/RP0/CPU0:router# configure
Step 3
router ospf process
Example:
RP/0/RP0/CPU0:router# router ospf 200
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
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Troubleshooting Layer 3 or Layer 4 Load Balancing Example, page
show route destination-address
configure
router ospf process
maximum paths number
end
show route destination-address
show ospf process interface brief
show running-config router ospf process
configure
interface type interface-path-id
cost value
end
show route destination-address
Chapter 13
Purpose
Displays the routes to a destination address. Use a
destination address on another host that is reachable
through the parallel links.
Verify that number of routes in the routing table equals the
number of parallel links. If you have fewer routes than
expected, continue with this procedure.
Enters global configuration mode.
Enters configuration mode for the OSPF process.
Troubleshooting Load Balancing
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