976 | Stacking
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Figure 47-3. Adding a Standalone with a Lower MAC Address and Equal Priority to a Stack—After
Stacking LAG
When multiple links are used between stack units, FTOS automatically bundles them in a stacking LAG to
provide aggregated throughput and redundancy. The stacking LAG is established automatically and
transparently by FTOS (without user configuration) once 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 S4810 supports stacking in a ring or a daisy chain topology. Dell Force10 recommends the ring
topology when stacking S4810 switches to provide redundant connectivity.
-------------------------------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 S50V, 52 ports)
3w1d14h: %S50V:2 %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
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
---------------------------------------------------------------------------
0 Standby online S50V S50V 7.8.1.0 52
1 Management online S50N S50N 7.8.1.0 52
2 Member online S50V S50V 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
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