Deploying the SG-9500
6-14
SG-9500 Hardware Guide
6.4
Active Redundancy
Active redundancy is recommended for network topologies where at least two
network links are active in load-balancing mode. It requires two Service Gateway
installations and typically, no bypass units.
In the Active Redundancy configuration, a Service Gateway duplicates each link’s
traffic to the other Service Gateway. Both Service Gateways are active.
In the event that one of the links fails due to router, switch or line malfunction, the
network redundancy mechanism (for example, spanning tree) will ensure that
traffic is routed or switched via the other link and managed by the second Service
Gateway. Since both Service Gateways maintain a constant view of the two links,
there will be no loss of flow's state and other information required for correct
shaping and application classification.
In the Active Redundancy configuration, the two Service Gateways should share the
same policy configuration.
NOTE Users should be aware that a Service Gateway working in Active Redundancy
mode duplicates all traffic passing through it. Therefore, the overall
throughput of each Service Gateway in Active Redundancy will be half of the
throughput enabled.
Physical Connections
NOTE
If the
Service Gateway Active Redundancy mechanism is implemented a
bypass unit should not be used. This ensures that the network is made aware
of any failure and is able to smoothly transfer traffic to the secondary link.
SG-9500 (24 1/10G Ports)
LINK
CONNECTION
P1.L1 (L1)
Int1
P1.L2 (L2)
Ext1
P1.L3 (L3)
Cloned Int1 to Second SG-9500
P1.L4 (L4)
Cloned Ext1 to Second SG-9500
P2.L1 (L5)
Int2
P2.L2 (L6)
Ext2
P2.L3 (L7)
Cloned Int2 to Second SG-9500
P2.L4 (L8)
Cloned Ext2 to Second SG-9500
P3.L1 (L9)
Int3