Black Box iPATH ACR1000A-CTL-24 User Manual page 28

• 802.3ad - This mode uses a similar topology to Active-Backup, (i.e. both network ports connected to the same switch) but
has two important differences: Both of the iPATH server network ports are used simultaneously, and the network switch must
support LACP (Link Aggregation Control Protocol).
The iPATH server will 'merge' (aggregate) the two connections and treat them as one. The only exception to this would be on
'multi-Subnet racks' where it would be possible to have each network connection on different switches.
This mode provides the benefit of increased bandwidth availability between the iPATH server and the network, but also
provides a layer of redundancy. If one of the network connections is lost, the remaining connection would take over until the
link is restored.
The network traffic is not split on a packet by packet basis between the connections; it operates on a connection basis. When
a connection is established between the iPATH server and one of the Agility endpoints, this would travel via one port. When a
second connection to another endpoint is established, this could use the same port or it may use the other. There is no order to
which network port is used for any connection.
Note: When changing between bonded and any other mode, a warning message will be displayed and, when the Save button is
clicked, will cause the iPATH server to be rebooted.
4.5.8.2 DEVICE CONNECTIVITY
IP Pool Lower/Upper Limits (not shown in multi-subnet mode)
When the iPATH server is used in single subnet mode, these two fields are used to define the range (pool) of IP addresses that
the iPATH server can automatically assign to new Agility endpoint devices. The iPATH server contains its own DHCP server with
which it applies the available IP addresses to Agility endpoint devices.
When used in multi-subnet mode, the internal DHCP server with the iPATH is disabled and instead the iPATH server will rely upon
an external DHCP server to provide valid IP address details.
Multicasting
Multicast IP Base
The start address for the multicast IP addresses to be used. Multicast IP addresses are in the range 237.1.1.1 to 239.255.255.255.
This setting lets you adjust this range of IP Multicast addresses. It is important to allow sufficient addresses for your system. For
instance, if the multicast IP address base was set to 239.255.255.252 there would only be 4 multicast addresses available.
Always Multicast
Determines whether multicast addressing is always used for video and audio streams. This should be used for most installations
as it provides the most efficient way to deliver video and audio to multiple destinations.
IGMP Version
By default, force IGMPv2 is enabled. However, if your network supports IGMPv3 you can take advantage of the IGMPv3 features
by applying the force IGMPv3.
Interfaces
Device network port
This lets the admin specify which port on iPATH to use for Agility control. This is either ETH1 the default or Both ports if the
iPATH has ETH1 and ETH2 connected to the Agility network.
Separate Device Networks
When this option is set to 'Yes', the Agility devices within the network will be instructed to promote a further level of network
resilience by treating their copper and fiber/teaming connections as independent links via separate switches (in conjunction with
dual independent cabling schemes) see the diagram on next page. If one connection route is compromised, the other will continue
unaffected. During normal operation, when both connection routes are operating, transfer speeds are boosted by the copper and fiber
links working in parallel.
The two Ethernet ports of the iPATH server can be connected to the two separate network switches to ensure that iPATH control
remains in place if one network switch should become unavailable.
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