Cisco Cisco Aironet 1522 Lightweight Outdoor Mesh Access Point Troubleshooting Guide
22
Troubleshooting a Mesh Network
OL-14326-01
Performance Notes
Performance Notes
Typical throughput and performance are based on backhaul performance delivered to the RAP, the
number of mesh hops, the noise and interference on the mesh wireless backhaul and on the wireless
access side as well as client transmit uplink power. Tools such as wireless 802.11 sniffers and software
spectrum analyzers can be used to troubleshoot local on-site issues.
number of mesh hops, the noise and interference on the mesh wireless backhaul and on the wireless
access side as well as client transmit uplink power. Tools such as wireless 802.11 sniffers and software
spectrum analyzers can be used to troubleshoot local on-site issues.
Additionally, Cisco WCS and the controller already have noise and interference feedback tools built-in
to the controller AP monitor and WCS Report pages; in general, these tools display Pass or Fail results
based on default criteria.
to the controller AP monitor and WCS Report pages; in general, these tools display Pass or Fail results
based on default criteria.
Figure 1
Transmission Control Protocol (TCP) Throughput vs. Channel Utilization
Link failure.
Reason given:
CHANGE_STATE_EVENT.
CHANGE_STATE_EVENT.
Note
Link failures are, in general, tied
to the non-receipt of LWAPP
ACKs by the AP.
to the non-receipt of LWAPP
ACKs by the AP.
1) Lack of connectivity between the
controller and the access points could be
tied to either problems with network
elements (wireless backhaul, switches, or
routers) or because of low SNR.
controller and the access points could be
tied to either problems with network
elements (wireless backhaul, switches, or
routers) or because of low SNR.
Note
Refer to the beginning of this
document, and begin step-by-step
troubleshooting.
document, and begin step-by-step
troubleshooting.
Maximum retransmissions timer has
exceeded its setting (60 retries).
exceeded its setting (60 retries).
1) Refer to the beginning of this
document, and begin step-by-step
troubleshooting.
document, and begin step-by-step
troubleshooting.
Table 10
LWAPP Failure Debugging (continued)
Problem
Solution/Debug Steps
7.5
6.5
5
1
Packets per second
Background 802.11b/g interference
Megabits
Resultant TCP
User TPUT
performance
100
300
500
800
8
6
4
2
0
231679