Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.1P1 - Page 871
Stacking LAG
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Stack MAC : 00:01:e8:d5:f9:6f -- Stack Info -- Unit UnitType Status ReqTyp CurTyp Version 0 Standby online S4820T 7.8.1.0 52 1 Management online S4820T 7.8.1.0 52 2 Member not present 3 Member not present 4 Member not present 5 Member not present 6 Member not present 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 Ports 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 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 configuration) 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. Stacking 871
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