Dell PowerConnect M6348 Configuration Manual

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Dell PowerConnect M6348 Configuration Manual Manual pdf 53 page image

Switching Configuration 53To prevent traffic from different groups being seen by other groups, a VLAN is reserved for eachAggregator Group by default. This VLAN reservation per group is not configurable; however you canconfigure each group to participate in more than one user-created (unreserved) VLAN. VLANs 4086 to4093 are reserved for each Aggregator Group, starting from 4086 for Group 1. The reserved VLANs areexcluded from the user-configurable VLAN list. Member ports of the Aggregator Group are excludedfrom all other VLANs except the one reserved for that Group. With this reserved VLAN count, themaximum user-configurable VLANs becomes 952 (1024-72). This VLAN segregation ensures that theflooding occurs only within the Aggregator Group but not across. The MAC Address tables are shown foreach Aggregator Group separately and an ‘all’ option in the CLI command can be used to show all themac-addresses in all the groups. You are not allowed to include a VLAN in more than one aggregatorgroup.To prevent network loops and maximize bandwidth to and from the switch, when the number of uplinkports (external ports) is more than 1, you can configure the LACP (802.3ad) capability on the uplinkports. The LAG uses hashing mode that is based on source MAC and destination MAC. You canconfigure 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, theuplink ports will be put into passive state (will be able to receive LACP PDUs only) and listen for theLACPDUs from the partner and negotiate the Link Aggregation. This means that the external (uplink)ports will be re-enabled once LACP is detected on the active uplink without user intervention. Whenconfigured in “off” mode, links on all but one uplink port in that Aggregator group will be forced toDOWN. In this case, lowest numbered uplink port will be active, and all other ports will be forced to“DOWN” state.To support NIC teaming failover on the server blades, all the internal ports in the Aggregator Group willbe brought DOWN, if the links on all the uplink ports in that Aggregator Group are DOWN. As soon asone or more of the uplink ports come UP, all the internal ports will be brought UP again. This is thedefault behavior with respect to Link Dependency. You can also configure the minimum number ofphysical uplinks ports to be active for an Aggregator Group to be active. By default this (minimumnumber of uplinks ports to be active) is 1, which means if there is at least 1 external port UP in theAggregator Group, all the internal ports will be kept open. Internal ports in the Aggregator Group will bedowned only when all the mapped external ports are down or disconnected. For example if you configure1/xg1, 1/xg2, 1/xg3, 1/xg4, 1/xg17, 1/xg18 as members of Group 1, and configure that the minimumnumber of uplink ports to be active as ‘2’, all the internal ports of the Aggregator Group will be broughtDOWN if any one of the links on 1/xg17 or 1/xg18 is DOWN. As soon as the links on both 1/xg17 and1/xg18 are UP, the internal ports shall be brought UP again.Simple Mode Operation• A new configuration mode, Aggregator Group Mode, has been created. You can enter this mode usingthe command port-aggregator group roup id> in Global Configuration mode. When Simple Modeis enabled, negotiation, speed, duplex, vlan, and mtu configurations are allowed on the AggregatorGroup but not on the individual ports. These configuration are applied to all the member ports of theAggregator Group.