NOTE:
The MAD readiness check is repeated periodically. If MAD-probe parameters have changed,
an appropriate message will be logged.
VLAN MAD
MAD VLAN can be used for management. Switches which support VSF and do not have OOBM ports, use front-
plane ports to detect active stack fragments upon split. One port from each member of the stack should be part of
a MAD VLAN and it should be connected to MAD interconnect device in the same network. MAD VLAN can be
used for the purpose of management like telnet and SSH. The front-plane ports of switches which support only
VSF will be part of one VLAN called MAD VLAN.
Limitations of VLAN MAD
• Any other protocol which may alter the functionality of VLAN MAD should not be enabled on VLAN MAD.
• Proper functionality of VLAN MAD cannot be ensured when there is more than one failure.
• Only one port per member can be assigned to the VLAN MAD.
• A source port filter cannot be configured on a port that is a member of the VLAN MAD.
• VLAN MAD cannot be configured on a VLAN that has source port filter enabled member ports.
• Trunk ports cannot be assigned to the VLAN MAD.
• The default VLAN cannot also be the VLAN MAD.
• GVRP cannot be configured on VLAN MAD member ports. Use the interface level
unknown-vlans
command
to disable GVRP in ports.
• MVRP cannot be enabled on VLAN MAD member ports.
• VLAN MAD cannot be configured when multicast filter is enabled for MAC address 0x00, 0x12, 0x79, 0x4a,
0xd5, and 0x82.
• LACP enabled port cannot be part of the MAD VLAN.
• BPDU filtering cannot be disabled on MAD VLAN ports.
Use Case 2: Replacing a switch in a stack
A stack maintains the MAC address of all member switches in its configuration. This is to enable the stack to
reform quickly upon reboot. In the event a failed switch needs to be replaced in the stack, the replacement switch
will be considered as a new switch joining the stack, and will be assigned an unused member and a default
configuration.
Switch# show vsf
VSF Domain ID : 164423
MAC Address : b05ada-96f043
VSF Topology : Chain
VSF Status : Fragment Active
Uptime : 0d 10h 30m
VSF MAD : None
VSF Port Speed : 1G
Software Version : WC.16.03.0003
Mbr
ID MAC Address Model Pri Status
--- ----------------- -------------------------------------- --- ---------------
1 b05ada-962160 Aruba JL253A 2930F-24G-4SFP+ Switch 128 Missing
*2 b05ada-96f040 Aruba JL253A 2930F-24G-4SFP+ Switch 250 Commander
708
Aruba 2930F / 2930M Management and Configuration Guide
for ArubaOS-Switch 16.08
