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AMF network guidelines
Page 18 | How to Configure and Use AMF on Allied Telesis Switches
AMF interaction with QoS and ACLs
It's important that ACL and QoS rules do not block any traffic on VLAN 4091 and 4092 as
they are the default AMF control VLANs. Likewise ACL and QoS rules should not block any
Layer 3 traffic on 172.31.0.* or 172.31.128.* as these are the default AMF management traffic
subnets. Packets with protocol type 0xfbae and BPDU packets that use the MAC address:
0180.c200.002e should also not be blocked.
Note: The AMF control VLANs and AMF management subnets can be manually changed.
With AMF enabled, the number of ACLs on the x510 switch decreases from 249 to 248. If
this is an issue, then you can disable AMF, which will allow the previous maximum of 249.
Enabling AMF on the x610 switch provides 2048 ACLs.
NTP and AMF
AMF uses NTP to synchronize the system clocks across nodes within the network. For this to
operate there must either be one or more external NTP servers configured on the network,
or one single AMF node must be configured as the NTP 'master' using the command ntp
master 11.
Note: It is not valid to have an NTP master configured on an AMF node anywhere in the
network if any external NTP servers exist, as this will prevent clock synchronization.
If there is no external server, and instead the network has a node configured with the
command: ntp master 11, the following commands will work as expected:
awplus (config)#atmf working set group all
awplus (config)#clock set 16:51:00 24 Aug 2012
The clock set command may also be used prior to configuring an external NTP server to
get the network roughly up to the correct time, so that NTP will synchronize faster
.
The primary function of NTP within an AMF network is to ensure that time and date stamps
on backups are consistent across member nodes within the backup. This is particularly
important in an AMF network that has multiple AMF master nodes, to ensure that node
recovery is performed with the most up to date backup.