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AMF safe configuration
Page 34 | How to Configure and Use AMF on Allied Telesis Switches
AMF safe configuration
If, for any reason, AMF automatic node recovery fails, AMF contains a safety net feature
which puts the replacement node into a safe configuration state. This is to prevent an
unconfigured device from joining the network and creating loops.
HowcanItellifmydevicehashadAMFsafeconfigurationapplied?
A log message will be generated when AMF safe configuration is applied. This message will
appear in the log some time after the startup sequence.
The message will also be output to the console or any connected VTY session.
22:39:30 awplus ATMF[638]: ATMF safe config applied (forwarding disabled)
What does safe config do?
The components of the AMF safe configuration are:
A special VLAN is created in the disabled state and given the name
atmf_node_recovery_safe_vlan. The index of this VLAN is determined
dynamically to ensure it does not conflict with AMF management VLANs which are
detected through the AMF network.
All ports are removed from their default VLAN membership (VLAN 1).
All ports are set as tagged members of the safe VLAN.
All ports are configured to have no native VLAN.
Additionally, all ports that are not an AMF link or cross-link are shutdown. The links and
crosslinks are detected by AMF and added to the dynamic configuration. This is done to
ensure correct behaviour of static aggregators and Layer 3 protocols configured on the
neighboring devices.
See below for example output of the show vlan brief command for a device in AMF safe
configuration mode:
awplus#sh vlan brief
VLAN ID Name Type State Member ports (u)-Untagged, (t)-Tagged
======= ================ ======= ======= =======================================
1 default STATIC ACTIVE
4090 atmf_node_recovery_safe_vlan
STATIC SUSPEND port1.0.1(t) port1.0.2(t) port1.0.3(t)
port1.0.4(t) port1.0.5(t) port1.0.6(t)
port1.0.7(t) port1.0.8(t) port1.0.9(t)
port1.0.10(t) port1.0.11(t)
port1.0.12(t) port1.0.13(t)
port1.0.14(t) port1.0.15(t)
port1.0.16(t) port1.0.17(t)
port1.0.18(t) port1.0.19(t)
port1.0.20(t) port1.0.21(t)
port1.0.22(t) port1.0.23(t)
port1.0.24(t)