User's Manual

DragonWave Inc.
126
Horizon Compact Plus Release 1.0.1 Wireless Ethernet Product User Manual – Volume 2
19.2 Network Loopback
The network loopback feature allows network troubleshooting between a Horizon Compact Plus and
another network device. The MAC address of the target device is included in the CLI command to
invoke the loopback. The source and destination MAC addresses are swapped so that loopback
packets may legally navigate a switched Ethernet network. Loopback packets may be directed into any
one of the five user QoS queues.
The queue and the timeout parameters are optional. The default queue is 1 and the default timeout
is 30 seconds.
If a timeout is applied then the loopback is removed when the timeout expires.
A timeout of 0 means that the loopback needs to be manually removed.
Network loopback is not saved in the mib and is removed automatically upon reboot.
A link must be operational in order to enable a far-end loopback.
If the link goes down then a far-end loopback is terminated.
Only a single loopback of any type (radio, network, eoam) is allowed at a time on a node.
If one type (far-end or near-end) of network loopback is active at one end of a link then the same
type of network loopback is allowed at the other end of the link however the opposite type of
loopback is not permitted. For example, if a near-end loopback is enabled at a node then a far-
end network loopback cannot be enabled at the other end of the link, however a near-end
network loopback could be.
Loopback packets must be a multiple of 4 bytes in length, not less than 64 bytes and not more than
500 bytes.
Live traffic takes priority over network loopback packets, so some network loopback packets may
be lost in the presence of a large amount of live traffic.
The following destination MAC addresses cannot be looped back:
1. All zeroes 00:00:00:00:00:00
2. Any broadcast or multicast address
3. The MAC address of the local node
4. The MAC address of the peer node
Procedure 19-2
Network Loopback
Required Action
Steps
login into the system.
Log in as a NOC account
View the status of the
network loopback feature
Use this command to return the current status of network loopback.
Sequence:
get network loopback press Enter
The system responds:
No loopback active