Cisco CRS-1 - Carrier Routing System Router Troubleshooting Manual page 258

Configuration Examples for Troubleshooting Load Balancing
Enter L4 protocol (TCP,UDP,SCTP,L2TPV3,NONE): TCP
Enter src port: 5500
Enter destination port: 80
Compute destination address set for all members? [y/n]: y
Enter subnet prefix for destination address set: 10.0.0.0
Enter bundle IP V4 address [192.168.254.1]: 10.12.48.1
S/D pair 192.168.254.1:5500/10.1.2.1:80 -- Link hashed to is GigabitEthernet0/6/5/5
Destination address set for subnet 10.0.0.0:
S/D pair 192.168.254.1:5500/10.0.0.3:80 hashes to link GigabitEthernet0/6/5/5
S/D pair 192.168.254.1:5500/10.0.0.9:80 hashes to link GigabitEthernet0/6/5/6
S/D pair 192.168.254.1:5500/10.0.0.1:80 hashes to link GigabitEthernet0/6/5/7
This shows that an ingress flow from 192.168.254.2:5500 on interface GigabitEthernet0/6/5/4 to
destination 10.1.2.1:80 would use egress interface GigabitEthernet0/6/5/5. You can verify that this
occurs by viewing the traffic for each of the bundle links, as shown in the following excerpts from show
interfaces:
RP/0/RP0/CPU0:RouterB# show interface Gi0/6/5/6
Tue Oct 28 03:43:18.783 PST DSTGigabitEthernet0/6/5/5 is up, line protocol is up
...
RP/0/RP0/CPU0:RouterB# show interface Gi0/6/5/6
Tue Oct 28 03:43:18.783 PST DST
GigabitEthernet0/6/5/6 is up, line protocol is up
...
RP/0/RP0/CPU0:RouterB# show interface Gi0/6/5/7
Tue Oct 28 03:43:23.482 PST DST
GigabitEthernet0/6/5/7 is up, line protocol is up
...
This verifies that the flow is using GigabitEthernet0/6/5/5, as expected. The other two links in the bundle
have incidental traffic.
Repeat this procedure for other flows. For example, for a flow exactly the same as the first except that
the destination port is 23, the bundle hash utility provides the following information:
RP/0/RP0/CPU0:RouterB# bundle-hash bundle-ether 12
Tue Oct 28 03:56:48.786 PST DST
Specify load-balance configuration (L3/3-tuple or L4/7-tuple) (L3,L4): L4
Single SA:SP/DA:SP pair (IPv4,IPv6) or range (IPv4 only): S/R [S]: S
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
13-248
16196 packets output, 875154 bytes, 0 total output drops
Output 0 broadcast packets, 12 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
3 packets output, 372 bytes, 0 total output drops
Output 0 broadcast packets, 3 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
3 packets output, 372 bytes, 0 total output drops
Output 0 broadcast packets, 3 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Chapter 13 Troubleshooting Load Balancing
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