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WAN Load Balancing 1-5
Software Version 2.7.5
C613-10454-00 REV A
Weighted Fast Response Distribution
This distribution method assigns new load balancer sessions to WAN ports
based on the response times recorded for the transmission of WAN load
balancer healthcheck messages. These messages are transmitted from each of
the WAN load balancer ports and record response times between these ports
and selected distant hosts. WAN ports that have faster healthcheck response
times will be selected more frequently than those with slower response times.
This distribution method is useful when network latency is an important
factor.
Note that you must configure WAN load balancer healthchecks in order to
operate the weighted fast response distribution. Without healthchecks
configured, the selection process will apply the equivalent of the round robin
selection method.
Each WAN load balancer resource maintains a moving average that covers the
last four response times for each healthcheck host. From the averages received
for each healthcheck host, the WAN load balancer calculates an overall average
for each port.
The following figure shows a simple single host network configured for
weighted fast response distribution.
The load balancer sends healthcheck messages from its ports 1 and 2, to remote
site A. Although the messages from each port have a common destination,
their network path and conditions are different.
Load Balancing Router
Healthcheck Message
WANLB_WFRes
Remote Site A
Port 2Port 1
ISP-1
ISP-2
- Software Version 2.7.5 1
- Overview of New Features 4
- MSS Clamping 5
- 8 MSS Clamping Release Note 8
- Software Version 2.7.5 9 9
- 10 MSS Clamping Release Note 10
- Syntax SHow PPP PPPoe 11
- Command changes 13
- Command Reference Updates 14
- Software Version 2.7.5 15 15
- Command Changes 18
- Syntax SHow IP 21
- DHCP Option 82 Relay 22
- Software Version 2.7.5 25 25
- Syntax SHow BOOTp RELAy 26
- IGMP Enhancements 28
- Filtering and Throttling 29
- Configuring IGMP 30
- IGMP Throttling 31
- Software Version 2.7.5 33 33
- Software Version 2.7.5 35 35
- OSPF Network Types 41
- [{FULl 45
- BGP Enhancements 46
- Automatic Summarising 48
- Aggregating Routes 50
- Software Version 2.7.5 53 53
- Syntax SHow BGP 55
- Syntax SHow BGP PEer[=ipadd] 56
- Software Version 2.7.5 59 59
- Software Version 2.7.5 61 61
- Firewall Enhancements 63
- UDP Port Timeout 65
- Software Version 2.7.5 67 67
- Software Version 2.7.5 73 73
- WAN Load Balancing 74
- VRRP Preemption Delay 75
- Software Version 2.7.5 77 77
- ..3600] [PRIOrity=1..254] 77
- Operating Principles 80
- Load Distribution Methods 81
- 1-4 Release Note 82
- WAN Load Balancing 1-5 83
- Healthcheck 84
- Assigning Weights 85
- Healthchecks 86
- Operation with Firewall 87
- 1-10 Release Note 88
- Before you 89
- Parameter Description 96
- ● eth (such as eth0, eth1) 100
- ● PPP (such as ppp0, ppp1) 100
- C613-10454-00 REV A 101
- Related Commands enable wanlb 109
- Syntax SHow WANLB 112
- Syntax SHow WANLB HEALthcheck 114
- ■ eth (such as eth0, eth1) 122
- ■ PPP (such as ppp0, ppp1) 122
- Filtering IP Routes 123
- 2-2 Release Note 124
- Introduction 125
- Types of Filters 126
- About AS Path Lists 127
- About Route Maps 127
- When to use 128
- About IP Route Filters 129
- Creating Filters 130
- Creating Route Maps for BGP 131
- How to create a route map 132
- ■ exclude the update message 133
- Example comparing 134
- AS path filter and 134
- Matching on 134
- Creating Route Maps for OSPF 138
- Creating IP Route Filters 141
- Applying Filters 142
- Applying AS path 143
- ■ prefix lists 148
- ■ AS path lists 148
- ■ route maps 148
- 2-28 Release Note 150
- [other-options] 150
- Filtering IP Routes 2-29 151
- The filtering 151
- Limitations of route 153
- Interface Routes 154
- Statically-Configured Routes 155
- Configuration Examples 156
- Using a Route Map 157
- Using an AS Path Filter 158
- Using Communities 160
- Command Reference 162
- Parameters for both 173
- Parameters for 173
- Parameters for set 176
- ■ an entire route map 181
- [PREfix=ipadd] 182
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