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WAN Load Balancing 1-3
Software Version 2.7.5
C613-10454-00 REV A
When WAN load balancing is disabled, the router uses its existing routing
protocols and tables to determine the path for a particular IP flow and will also
remember this route for future packets that belong to the same flow.
In order to efficiently operate with applications that can simultaneously run
multiple applications, the WAN load balancer is able to create sessions without
the need to specify port information.
The load balancer manages its sessions (creating, deleting, etc.) by starting a
timer for each new session created. Each timer is refreshed when a packet for
its particular session passes through the load balancer. When a particular timer
reaches its orphantimeout value, its associated session is deemed to be orphan
and is deleted.
If the load balancer is unable to find a particular resource in its tables and
alternative non-load-balanced routes exist, the router will use the best
alternative route available. Note that it is not mandatory for a router’s WAN
links to operate via the load balancer.
Load Distribution Methods
The following load distribution methods can be configured:
■ Round Robin Distribution
■ Weighted Lottery Distribution
■ Weighted Least Connect Distribution
■ Weighted Fast Response Distribution
Round Robin Distribution
This distribution method assigns new load balancer sessions alternately to each
of the WAN ports available. This distribution method is simple to implement
and is light on processing resources. However, round robin takes no account of
factors such as the bandwidth of each WAN connection, as does the weighted
lottery distribution method, which is described next.
Weighted Lottery Distribution
This distribution method assigns load balancer sessions to WAN ports by using
a pseudo-random selection process. Each WAN port is assigned a weighting
factor that increases or decreases the chances of the pseudo-random selection
process selecting a particular port. Weighting factors can be set either manually
or automatically.
When configuring the WAN load balancer manually, we recommend setting
the weighting factor equal to the bandwidth of the link divided by a factor such
as 1000. Therefore, a 10 Mbps link would be assigned a weighting factor of
10000000 ÷ 1000 = 10000.
The higher the weighting factor that is applied to a port, the greater will be its
chances of being selected.
- 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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