Users Guide
7 Member not present
[output omitted]
Stack#show system stack-unit 0 | grep priority
Master priority : 0
Stack#show system stack-unit 1 | grep priority
Master priority : 0
Example of Adding a Standalone with a Lower MAC Address and Equal Priority to a Stack
---------------STANDALONE AFTER CONNECTION-----------------
Standalone#%STKUNIT0-M:CP %POLLMGR-2-ALT_STACK_UNIT_STATE: Alternate Stack-unit is present
00:20:20: %STKUNIT0-M:CP %CHMGR-5-STACKUNITDETECTED: Stack unit 1 present
00:20:22: %STKUNIT0-M:CP %CHMGR-5-STACKUNITDETECTED: Stack unit 2 present
Going for reboot. Reason is Stack merge
[bootup messages omitted]
---------------STACK AFTER CONNECTION---------------------
Stack# 3w1d14h: %STKUNIT1-M:CP %CHMGR-5-STACKUNITDETECTED: Stack unit 2 present
3w1d14h: %STKUNIT1-M:CP %CHMGR-2-STACKUNIT_DOWN: Stack unit 2 down - card removed
3w1d14h: %STKUNIT1-M:CP %CHMGR-5-STACKUNITDETECTED: Stack unit 2 present
3w1d14h: %STKUNIT1-M:CP %CHMGR-5-CHECKIN: Checkin from Stack unit 2 (type
S4820T , 52 ports)
3w1d14h: %S4820T %CHMGR-0-PS_UP: Power supply 0 in unit 2 is up
3w1d14h: %STKUNIT1-M:CP %CHMGR-5-STACKUNITUP: Stack unit 2 is up
Stack#show system brief
Stack MAC : 00:01:e8:d5:f9:6f
Reload-Type : normal-reload [Next boot : normal-reload]
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
-------------------------------------------------------
0 Standby online
S4820T 7.8.1.0 52 S4820T 7.8.1.0 52
1 Management online S4820T 7.8.1.0 52 S4820T 7.8.1.0 52
2 Member online S4820T 7.8.1.0 52 S4820T 7.8.1.0 52
3 Member not present
4 Member not present
5 Member not present
6 Member not present
7 Member not present
Stacking LAG
When multiple links are used between stack units, Dell Networking OS automatically bundles them in a stacking LAG to provide
aggregated throughput and redundancy.
The stacking LAG is established automatically and transparently by Dell Networking OS (without user conguration) after peering is
detected and behaves as follows:
• The stacking LAG dynamically aggregates; it can lose link members or gain new links.
• Shortest path selection inside the stack: If multiple paths exist between two units in the stack, the shortest path is used.
Supported Stacking Topologies
The device supports stacking in a ring or a daisy chain topology.
Dell Networking recommends the ring topology when stacking the switches to provide redundant connectivity.
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Stacking