Dell POWEREDGE M1000E - Manual (Page 13)

PowerConnect M6220/M6348/8024/8024F/M8024/M8024-k/
7024/7048/7024P/7048P/7024F/7048R/7048R-RA Release Notes
System Firmware Version 4.1.0.6 Page 11
 LACP Ports Inactive Until Attached
Ports in a LAG configured to use LACP (dynamic LAG) remain inactive (discard received traffic) until they become
attached to the LAG. LACP ports that are attached to a LAG will enter the discarding state if they become detached
from the LAG for any reason.
Port level configuration for a port that is configured in a dynamic LAG is disregarded. Remove the port from the LAG
to restore use of the port level configuration.
Ports in a static LAG begin forwarding on link up. Ports in a static LAG disregard port level configuration. Configure
static LAG functions on the static LAG interface.
NOTE: It is recommended that administrators disable portfast and auto-
portfast on physical interfaces configured in a LAG. Portfast and auto-
portfast can interfere with an interface entering into LAG mode on a
reboot and possibly enable a packet storm.
 Spanning Tree Changes
Administrators may assign more than 1024 VLANs to MSTP instances. Only VLANs that are configured on the switch
will forward traffic.
The PowerConnect switches implements the 802.1Q-2005 standard which builds on 802.1D-2004. 802.1D-2004
incorporates the the 802.1t, 802.1w and 802.1s revisions. Port path costs are calculated based on the interface speed as
shown below and are dynamically recalculated on interface activation and link speed changes.
External Port Path Cost values (Port Path Cost in 17.14 of 802.1D-2004) are applicable in STP, RSTP, and MST modes
(Ref. Table 17-3 802.1D-2004). Use the spanning-tree cost command in interface mode to set the external port path
cost.
Link Speed Default Value
10 Gb/s 2000
1 Gb/s 20000
100 Mb/s 200000
10 Mb/s 2000000
1 Mb/s 20000000
Internal Port Path Cost values are specific to MST mode only (Ref. Table 13-3 802.1Q-2005). Use the spanning-tree
mst cost command in interface mode to set the internal port path cost.
Link Speed Default Value
10 Gb/s 2000
1 Gb/s 20000
100 Mb/s 200000
10 Mb/s 2000000
1 Mb/s 20000000