Nortel 8300 用户指南
30
VLANs, Spanning Tree, and Static Link Aggregation
Link aggregation traffic distribution
Static aggregation groups can be used to aggregate bandwidth between
two switches. The ERS 8300 distributes traffic by determining the active
port in a link aggregation group that can be used for each outgoing packet.
Link aggregation group algorithms provide load sharing while ensuring that
packets do not arrive out of sequence.
two switches. The ERS 8300 distributes traffic by determining the active
port in a link aggregation group that can be used for each outgoing packet.
Link aggregation group algorithms provide load sharing while ensuring that
packets do not arrive out of sequence.
The ERS 8300 determines the port a packet is transmitted through by:
•
Tabulating the trunks and their active assigned port members for each
link aggregation group. Ports defined as trunk members are written to
the table in the order in which they are activated. If a link goes down, the
table is rewritten with one less trunk member.
link aggregation group. Ports defined as trunk members are written to
the table in the order in which they are activated. If a link goes down, the
table is rewritten with one less trunk member.
•
Using a selected index, based on traffic type and a hashing algorithm.
Packet distribution methods
shows the methods used, by type of packet, to distribute packets
with a trunk destination.
Table 5
Methods of traffic distribution for packets with a trunk destination
Methods of traffic distribution for packets with a trunk destination
Type of packet
MAC
source
address
(SA)
source
address
(SA)
MAC
destination
address (DA)
destination
address (DA)
IPv4
source IP
address
(SIP)
source IP
address
(SIP)
IPv4
destination
IP address
(DIP)
destination
IP address
(DIP)
Layer 3
protocol
protocol
Bridged packet
X
X
Bridged packet with
Layer 3 trunk load
balancing
Layer 3 trunk load
balancing
X
X
Routed packet
X
X
X
Trunk load sharing algorithms by traffic type
For information about hashing parameters and algorithms that are used for
distributing link aggregation traffic, see Nortel Ethernet Routing Switch 8300
Planning and Engineering—Network Design Guidelines (NN46200-200).
distributing link aggregation traffic, see Nortel Ethernet Routing Switch 8300
Planning and Engineering—Network Design Guidelines (NN46200-200).
Link aggregation rules
This section describes the rules for the link aggregation groups in the ERS
8300 ..
8300 ..
•
Link aggregation is supported on 10BASE-T, 100BASE-TX,
100Base-FX, Gigabit Ethernet ports, and 10Gigabit Ethernet ports.
100Base-FX, Gigabit Ethernet ports, and 10Gigabit Ethernet ports.
•
The switch supports eight ports per aggregation group. All ports in a
link aggregation group must be of the same media type and have the
same speed and duplex settings.
link aggregation group must be of the same media type and have the
same speed and duplex settings.
Nortel Ethernet Routing Switch 8300
Configuration — VLANs, Spanning Tree, and Static Link Aggregation using Device Manager
NN46200-510
03.01
Standard
4.0
27 August 2007
Copyright © 2005-2007, Nortel Networks
.