Huawei quidway s7700 Configuration Manual page 235

Quidway S7700 Smart Routing Switch
Configuration Guide - SPU
By using the dynamic load balancing algorithm, multiple egress links share the traffic. The
algorithm is easily configured and adapts to the network structure change. The preceding
problem can be solved.
Figure 6-1 Typical networking of egress link load balancing
As shown in
the internal network to the external network to multiple links. One ISP gateway corresponds to
one link. The egress link load balancing process is as follows:
1.
2.
3.
The egress link load balancing supported by the SPU has the following characteristics:
l
l
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Issue 01 (2011-07-15)
Figure 6-1
Enterprise
network
Switch
Figure 6-1, Switch is the load balancing device and distributes the traffic sent from
Users on the internal network send requests to servers on the external network.
When the request packets pass through Switch, Switch selects a link according to the
configured load balancing algorithm, weights, priorities, and inbound/outbound bandwidth
limits, and forwards the request packets to the selected link.
After receiving the response packets of servers on the external network, Switch forwards
the response packets to the users on the internal network.
Load balancing algorithm
It supports the WRR algorithm, least connection algorithm, and hash algorithm based on
the IP address.
Link bandwidth threshold
The link bandwidth threshold can be set for the inbound or outbound traffic. When the
bandwidth threshold or the percentage of the bandwidth threshold is exceeded, the load
balancing device does not select the ISP link.
Link health detection
After an Internet Control Message Protocol (ICMP) probe is configured on the SPU, the
SPU periodically sends probing packets to the link gateway to detect the connectivity
between nodes along the link.
Forwarding mode
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shows the typical networking of egress link load balancing.
RouterA
ISP1
ISP2
RouterB
ISP3
RouterC
6 Load Balancing Configuration
Server on the
external network
IP
Network
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