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Chapter 3 High Availability Networking
High availability networking is achieved by eliminating any single point of failure through
redundant connectivity: Redundant cables, switches and network interfaces for hardware,
combined with HA software solutions on both the hosts and switches to control the HA hardware
and maintain connectivity. An HA solution called Surviving Partner is provided on the switch.
For host-side HA, the most common solution is to use the Linux bonding driver. HA solutions
like the Linux bonding driver present a single, virtual interface to the protocol stack while
managing multiple physical links. Figure 3.1: Host HA Architecture shows the relation of the
protocol stack, a bonding driver and physical ports.
A failover between physical links can be made very quickly without requiring change to the IP or
MAC address of the virtual interface, effectively transparent from the applications point of view.
With redundant links from a switch (or switches) to the host, one link is maintained as the
ACTIVE link and the other as STANDBY. If the ACTIVE link were to go down, the STANDBY
becomes the new ACTIVE, while presenting the same virtual interface to the host.
NOTE: It is important that the bonding solution provide an active-backup mode. For the
Linux bonding driver set “mode == 1” see the
http://sourceforge.net/projects/bonding/
documentation for more information. Use the recommendations for Linux kernel 2.4x not
2.6x.
Redundant connections provide an ACTIVE and STANDBY link to a switch, or provide
redundant links between more than one switch. In the case of more than one switch, a complete
HA solution requires a switch-based HA solution.
Surviving Partner
Surviving Partner is a switch-based HA solution. Surviving Partner runs on the switches to
provide transition of Layer 2 and Layer 3 switching functionality between two or more switches.
Surviving Partner is comprised of many interactive protocols and processes including
VRRP
,
zlmd
,
zlc
, and others.
Ethernet Switch Blade User's Guide
release 3.2.2j
page 27
Figure 3.1: Host HA
Architecture
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Страница 227: ...SEE ALSO ifconfig 8 Ethernet Switch Blade User s Guide release 3 2 2j page 227...
Страница 237: ...be also reset SEE ALSO zspconfig Ethernet Switch Blade User s Guide release 3 2 2j page 237...
Страница 239: ...SEE ALSO ztmd tc 8 zfilterd Ethernet Switch Blade User s Guide release 3 2 2j page 239...
Страница 262: ...SEE ALSO zqosd iptables 8 tc 8 zfilterd Ethernet Switch Blade User s Guide release 3 2 2j page 262...
Страница 265: ...SEE ALSO zconfig zl2d Ethernet Switch Blade User s Guide release 3 2 2j page 265...
Страница 318: ...be also reset SEE ALSO zspconfig Ethernet Switch Blade User s Guide release 3 2 2j page 318...
Страница 320: ...SEE ALSO ztmd tc 8 zfilterd Ethernet Switch Blade User s Guide release 3 2 2j page 320...
Страница 335: ...Ethernet Switch Blade User s Guide release 3 2 2j page 335...
Страница 344: ...SEE ALSO zqosd iptables 8 tc 8 zfilterd Ethernet Switch Blade User s Guide release 3 2 2j page 344...
Страница 359: ...Index ztmd 301 zvlan 179 258 ZX4920 MIB 333 7100 User s Guide release 3 2 2j page 359...