3com 8807 User Guide
14
L
INK
A
GGREGATION
C
ONFIGURATION
Overview
Introduction to Link
Aggregation
Link aggregation means aggregating several ports together to implement the
outgoing/incoming payload balance among the member ports and enhance the
connection reliability. Link aggregation may be manual aggregation, dynamic
LACP aggregation or static LACP aggregation. For the member ports in an
aggregation group, their basic configurations must be the same. That is, if one is a
trunk port, others must also be; when it turns into access port, then others must
change to access port.
outgoing/incoming payload balance among the member ports and enhance the
connection reliability. Link aggregation may be manual aggregation, dynamic
LACP aggregation or static LACP aggregation. For the member ports in an
aggregation group, their basic configurations must be the same. That is, if one is a
trunk port, others must also be; when it turns into access port, then others must
change to access port.
Basic configuration includes STP setting, QoS setting, VLAN setting, and port
setting. The STP setting includes STP enabling/disabling, link attribute
(point-to-point or not), STP priority, path cost, max transmission speed, loop
protection, root protection, edge port or not. The QoS setting includes traffic
limiting, priority marking, default 802.1p priority, bandwidth assurance,
congestion avoidance, traffic redirection, and traffic statistics. The VLAN setting
includes permitted VLAN types, default VLAN ID. The port setting includes port
link type.
setting. The STP setting includes STP enabling/disabling, link attribute
(point-to-point or not), STP priority, path cost, max transmission speed, loop
protection, root protection, edge port or not. The QoS setting includes traffic
limiting, priority marking, default 802.1p priority, bandwidth assurance,
congestion avoidance, traffic redirection, and traffic statistics. The VLAN setting
includes permitted VLAN types, default VLAN ID. The port setting includes port
link type.
One Switch 8800 Family series routing switch can support up to 920 aggregation
groups. IDs 1 though 31 indicate manual or static aggregation groups. IDs 32
through 64 are reserved. IDs 65 though 192 are routed trunks; IDs 193 through
920 indicate dynamic aggregation groups. The systems with MPLS VPN cards only
support seven load balancing aggregation groups; those without MPLS VPN cards
support 31 load balancing aggregation groups. The systems with FE modules
using EX chips only supports seven load balancing aggregation groups.
groups. IDs 1 though 31 indicate manual or static aggregation groups. IDs 32
through 64 are reserved. IDs 65 though 192 are routed trunks; IDs 193 through
920 indicate dynamic aggregation groups. The systems with MPLS VPN cards only
support seven load balancing aggregation groups; those without MPLS VPN cards
support 31 load balancing aggregation groups. The systems with FE modules
using EX chips only supports seven load balancing aggregation groups.
n
At present, Switch 8800 Family series also support trans-module aggregation. The
trans-module aggregation is the same as the intra-module aggregation.
trans-module aggregation is the same as the intra-module aggregation.
Introduction to LACP
Link aggregation control protocol (LACP) based on the IEEE802.3ad standard can
be used in dynamic link aggregation. An LACP-enabled port sends link
aggregation control protocol data units (LACPDUs) to tell the peer about its system
priority, system MAC address, port priority, port number and operation key. After
receiving the information from the sender, the receiver compares it with the locally
saved information about other ports, chooses member ports for the aggregation
group and reaches agreement about if a port can join or leave a dynamic
aggregation group.
be used in dynamic link aggregation. An LACP-enabled port sends link
aggregation control protocol data units (LACPDUs) to tell the peer about its system
priority, system MAC address, port priority, port number and operation key. After
receiving the information from the sender, the receiver compares it with the locally
saved information about other ports, chooses member ports for the aggregation
group and reaches agreement about if a port can join or leave a dynamic
aggregation group.
During port aggregation, LACP generates a configuration mix according to the
port configuration (rate, duplex, basic configuration, management key), which is
called an operation key. The management key of an LACP-enabled dynamic
aggregation port is 0 by default. The management key of an LACP-enabled static
port configuration (rate, duplex, basic configuration, management key), which is
called an operation key. The management key of an LACP-enabled dynamic
aggregation port is 0 by default. The management key of an LACP-enabled static