configure ports limit-learning lock-learning
ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
ExtremeWare XOS 11.5 Command Reference Guide
955
configure ports limit-learning lock-learning
configure ports <portlist> vlan <vlan name> [limit-learning <number> |
lock-learning | unlimited-learning | unlock-learning]
Description
Configures virtual ports for limited or locked MAC address learning.
Syntax Description
Default
Unlimited, unlocked learning.
Usage Guidelines
If you have enabled ESRP, see the
ExtremeWare XOS Concepts Guide
for information about using this
feature with ESRP.
Limited learning.
The limited learning feature allows you to limit the number of dynamically-learned
MAC addresses per VLAN. When the learned limit is reached, all new source MAC addresses are
blackholed at both the ingress and egress points. This prevent these MAC addresses from learning and
responding to Internet control message protocol (ICMP) and address resolution protocol (ARP) packets.
If the limit you configure is greater than the current number of learned entries, all the current learned
entries are purged.
Dynamically learned entries still get aged, and can be cleared. If entries are cleared or aged out after the
learning limit has been reached, new entries will then be able to be learned until the limit is reached
again.
Permanent static and permanent dynamic entries can still be added and deleted using the
create
fdbentry
and
delete fdbentry
commands. These override any dynamically learned entries.
portlist
Specifies one or more ports or slots and ports.
vlan name
Specifies the name of the VLAN.
limit-learning <number>
Specifies a limit on the number of MAC addresses that can be dynamically
learned on the specified ports.
lock-learning
Specifies that the current FDB entries for the specified ports should be made
permanent static, and no additional learning should be allowed.
unlimited-learning
Specifies that there should not be a limit on MAC addresses that can be
learned.
unlock-learning
Specifies that the port should be unlocked (allow unlimited, dynamic learning).
