Dell PowerConnect M6220 Configuration Manual page 47

Table 3-2. Default Port Aggregator Group Mapping
Aggregator Member Internal Ports
Group
Group 1 1/g1,1/g2,1/g3,1/g4, 1/g5, 1/g6, 1/g7, 1/g8,
1/g9, 1/g10, 1/g11, 1/g12, 1/g13, 1/g14, 1/g15,
1/g16
Group 2 2/g1,2/g2,2/g3,2/g4, 2/g5, 2/g6, 2/g7, 2/g8,
2/g9, 2/g10, 2/g11, 2/g12, 2/g13, 2/g14, 2/g15,
2/g16
Group 3
The same default configuration is extended to a stack of switches, with internal member ports 3/g1 to
3/g16 and external member ports 3/g17 to 3/g20 in one Aggregator Group, and so on. Default
configuration does not include 10Gig ports as part of any Aggregator Group, although they can be used if
desired.
1G and 10G external ports cannot be used at the same time.
A standalone switch in Simple Mode will support up to 8 Aggregator Groups and a stack will support up
to '6*<Number of Units in stack>' Aggregator Groups. For example, in a stack of 4 units, the maximum
number of Aggregator Groups is 24. On a 12 unit stack, the maximum number of groups is 72.
The number of internal ports in an Aggregator Group is unlimited and you can configure any number of
internal ports in each Aggregator Group. The number of external ports that can be included in a group is
limited to the maximum number of ports that can be included in a LAG. On the M6220, eight ports is
the maximum number that can be in a LAG. Any member port, either internal port or external port, is
not allowed to participate in more than one Aggregator Group.
To prevent traffic from different groups being seen by other groups, a VLAN is reserved for each
Aggregator Group by default. This VLAN reservation per group is not configurable; however you can
configure each group to participate in more than one user-created (unreserved) VLAN. VLANs 4022 to
4093 are reserved for each Aggregator Group, starting from 4022 for Group 1. The reserved VLANs are
excluded from the user-configurable VLAN list. Member ports of the Aggregator Group are excluded
from all other VLANs except the one reserved for that Group. With this reserved VLAN count, the
maximum user-configurable VLANs becomes 952 (1024-72). This VLAN segregation ensures that the
flooding occurs only within the Aggregator Group but not across. The MAC Address tables are shown for
each Aggregator Group separately and an 'all' option in the CLI command can be used to show all the
mac-addresses in all the groups. You are not allowed to include a VLAN in more than one aggregator
group.
To prevent network loops and maximize bandwidth to and from the switch, when the number of uplink
ports (external ports) is more than 1, you can configure the LACP (802.3ad) capability on the uplink
ports. The LAG uses hashing mode that is based on source MAC and destination MAC. You can
configure the LACP mode to static/auto/off on the multiple uplink ports. When configured in "static"
mode, the uplink ports will be set to Static mode (static LAG). When configured in "auto" mode, the
uplink ports will be put into passive state (will be able to receive LACP PDU's only) and listen for the
—
Member Uplink (External) Ports
1/g17, 1/g18, 1/g19, 1/g20
2/g17, 2/g18, 2/g19, 2/g20
—
Switching Configuration
47