stack-mac persistent timer
To enable the persistent MAC address feature, use the
stack-mac persistent timer
command in global
configuration mode on the switch stack or on a standalone switch. To disable the persistent MAC address
feature, use the
no
form of this command.
stack-mac persistent timer
[
0
|
time-value
]
no stack-mac persistent timer
Syntax Description
(Optional) Continues using the MAC address of the current active switch indefinitely,
even after a new active switch takes over.
0
(Optional) Time period in minutes before the stack MAC address changes to that of
the new active switch. The range is 1 to 60 minutes.
time-value
Command Default
Persistent MAC address is disabled. The MAC address of the stack is always that of the first active switch.
Command Modes
Global configuration
Command History
Modification
Release
This command was introduced.
Cisco IOS XE 3.3SECisco IOS XE 3.3SE
Usage Guidelines
By default, the stack MAC address will always be the MAC address of the first active switch, even if a new
active switch takes over. The same behavior occurs when you enter the
stack-mac persistent timer
command
or the
stack-mac persistent timer 0
command.
When you enter the
stack-mac persistent timer
command with a
time-value
, the stack MAC address will
change to that of the new active switch after the period of time that you entered whenever a new switch
becomes the active switch. If the previous active switch rejoins the stack during that time period, the stack
retains its MAC address for as long as the switch that has that MAC address is in the stack.
If the whole stack reloads the MAC address of the active switch is the stack MAC address.
If you do not change the stack MAC address, Layer 3 interface flapping does not occur. This also means
that a foreign MAC address (a MAC address that does not belong to any of the switches in the stack) could
be the stack MAC address. If the switch with this foreign MAC address joins another stack as the active
switch, two stacks will have the same stack MAC address. You must use the
stack-mac update force
command to resolve the conflict.
Note
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
875
stack-mac persistent timer
Summary of Contents for Catalyst 3650 Series
Page 2: ... 2017 Cisco Systems Inc All rights reserved ...
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Page 51: ...P A R T II Interface and Hardware Components Interface and Hardware Commands page 27 ...
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Page 235: ...P A R T IV IP Multicast Routing IP Multicast Routing page 211 ...
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Page 303: ...P A R T V IPv6 IPv6 page 279 ...
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Page 307: ...P A R T VI Layer 2 3 Layer 2 3 page 283 ...
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Page 399: ...P A R T VII Multiprotocol Label Switching MPLS MPLS page 375 Multicast VPN page 385 ...
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Page 429: ...P A R T VIII Network Management Flexible NetFlow page 405 Network Management page 479 ...
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Page 595: ...P A R T IX Programmability Programmability page 571 ...
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Page 625: ...P A R T X QoS Auto QoS page 601 QoS page 641 ...
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Page 706: ...Command Reference Cisco IOS XE Everest 16 5 1a Catalyst 3650 Switches 680 trust device ...
Page 707: ...P A R T XI Routing Bidirectional Forwarding Detection page 683 ...
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Page 875: ...P A R T XIII Stack Manager and High Availability Stack Manager and High Availability page 851 ...
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Page 1100: ...Command Reference Cisco IOS XE Everest 16 5 1a Catalyst 3650 Switches 1074 vtp primary ...
Page 1102: ...Command Reference Cisco IOS XE Everest 16 5 1a Catalyst 3650 Switches 1076 Notices ...
Page 1108: ...Command Reference Cisco IOS XE Everest 16 5 1a Catalyst 3650 Switches IN 6 Index ...