Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 92
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ServerIron ADX Firewall Load Balancing Guide 81
53-1002436-01
Configuration example for a high-availability multizone FWLB
4
DRAFT: BROCADE CONFIDENTIAL
Failover algorithm
ServerIron ADXs in high-availability multizone FWLB configurations use the following criteria for
failover:
• Connection to zones – If one ServerIron ADX in an active-standby ServerIron ADX has
connectivity to more zones than the other ServerIron ADX, the ServerIron ADX with connectivity
to more zones is the active ServerIron ADX.
• Total number of good paths – If each ServerIron ADX has connectivity to an equal number of
zones, the ServerIron ADX with more good paths, within the configured tolerance, is the active
ServerIron ADX. The paths include firewall paths and router paths. By default, the ServerIron
ADXs can tolerate up to half of the firewall paths and half the router paths being down before
failover based on good paths occurs. You can change the path tolerance.
• Priority – If all the previous metrics are equal on each ServerIron ADX, the ServerIron ADX with
the higher priority is the active ServerIron ADX.
Configuration example for a high-availability multizone FWLB
The following sections show all the ServerIron ADX commands you would enter on each ServerIron
ADX to implement the configuration shown in
Figure 14 on page 79.
Most of the configuration tasks for high-availability multizone FWLB are the same as the tasks for
other FWLB configurations.
Commands on Zone1-SI-A zone 1
The following commands configure ServerIron ADX “Zone1-SI-A” on the left side of zone 1 in
Figure 14 on page 79.
The following commands change the device name, configure the management IP address, and
specify the default gateway. Notice that the management IP address is in the same sub-net as the
firewall interface with the ServerIron ADX. If the ServerIron ADX and the firewall are in different
sub-nets, you must configure source IP addresses and enable source NAT.
In this configuration, the default gateway for each ServerIron ADX is the IP address of the firewall
interface with that ServerIron ADX. In this case, the IP address is the address of firewall FW1’s
interface with this ServerIron ADX.
ServerIronADX(config)# hostname Zone1-SI-A
Zone1-SI-A(config)# ip address 209.157.24.13 255.255.255.0
Zone1-SI-A(config)# ip default-gateway 209.157.24.1
The following command disables the Spanning Tree Protocol (STP). You must disable STP on all the
devices in this type of FWLB configuration.
Zone1-SI-A(config)# no span
The following command identifies the router port, which is the ServerIron ADX port connected to a
router. In the example in
Figure 14 on page 79, each ServerIron ADX has one router port.
Zone1-SI-A(config)# server router-ports 5
- ServerIron ADX 1
- Document History 2
- Contents 3
- About This Document 8
- Document conventions 9
- Notice to the reader 10
- Related publications 11
- ServerIron FWLB Overview 12
- Firewall environments 14
- Load balancing paths 15
- Firewall selection 17
- Hashing mechanism 17
- Stateful FWLB 18
- Health checks 18
- Path health checks 19
- Application health checks 19
- Firewall health check debug 21
- Basic FWLB topology 22
- HA FWLB topology 23
- Failover 24
- Router paths 24
- Multizone FWLB topology 25
- FWLB configuration limits 26
- Configuring Basic FWLB 28
- IPv4 Firewall-1 37
- IPv4 Firewall-2 37
- External 40
- Internal 40
- Firewall-2 42
- Firewall-1 42
- Configuring HA FWLB 48
- Session limits 49
- Session aging 49
- Task Reference 52
- Configuring the firewall port 53
- Configuring the partner port 54
- Configuring the router port 55
- Configuring the firewalls 55
- Adding the firewalls 55
- Connection rate control 57
- Complete CLI example 62
- HA FWLB with VRRP 73
- Usage notes 78
- Configuring Multizone FWLB 82
- Zone 3Zone 2 84
- Zone1-SI(config)# no span 85
- Failover algorithm 92
- Commands on Zone1-SI-A zone 1 92
- DRAFT: BROCADE CONFIDENTIAL 100
- 53-1002436-01 102
- SI-A SI-A 104
- In this chapter 124
- NAT firewalls 124
- Extra firewall method 129
- Access policy method 130
- Specifying the partner port 134
- Specifying the router ports 134
- Configuring FWLB and SLB 146
- Configuring SLB-to-FWLB 148
- Configuring the real servers 149
- Enabling SLB-to-FWLB 150
- Configuring FWLB-to-SLB 152
- Enabling FWLB-to-SLB 154
- FWLB configuration overview 166
- TCP/UDP port statistics 169
- FWLB path information 172
- Field Description 173
- • 6 – TCP 174
- • 17 – UDP 174
- In this appendix 176
- FWLB selection algorithms 182
- Configuration guidelines 186
- Denying FWLB 187
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