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Dialogic

DSI Signaling Server SGW Mode User Manual Issue 5

7.6 Resilience

7.6.1 IP Port Bonding

The Signaling Gateway allows the user to configure a resilient IP connection across an IP port bonding team

of two ports in an active/standby configuration. On the Dialogic

DSI SS7G21, SS7G22 and SS7G31

Signaling Servers, up to two port bonding teams may be created using the four Ethernet ports on the SGW.

The Dialogic

DSI SS7G32 Signaling Server has 6 Ethernet ports, allowing up to three port bonding teams.

Each team has a single IP address configured with a primary (active) and secondary (standby) port. Any IP

port on the system may be the primary port in a team and any port may be the secondary port. The primary

port is a port configured with the IP address of the team and the secondary port is a port configured with a

string to associate it with the primary port.

If the system detects that the Primary port has failed, it passes the primary’s MAC and Layer 3 address to

the failover (secondary) adapter, enabling it to act as the active port in the team. On the restoration of the

primary port, the secondary port is removed from service and the primary port resumes control of its MAC

and IP addresses.

The subnet mask of a secondary IP address in a team is ignored. Data loss may occur between the actual

failure of an IP connect and the detection of that failure and subsequent switching to the standby port. All

adapters in a team should be connected to the same hub or switch with Spanning Tree (STP) set to off.

Whenever teaming is activated, or deactivated, MMI sessions using those ports are reset. An IP address may

not be teamed with:

• itself

• an IP address of 0.0.0.0

• another IP address already acting as a primary or standby in an IP team

Once configured the status of Ethernet ports in a bonded team may be checked using the STEPP command

(see Section 6.14.7 on page 127).

7.6.2 Dual Resilient Operation

Two Signaling Gateways have the ability to work in conjunction with one another to realize a single SS7

signaling point where the operation of the Message Transfer Part (MTP) is distributed. Failure (or planned

maintenance) of one or other of the Signaling Gateways operating in “Dual Mode” therefore does not result

in a loss of SS7 signaling capability.

The use of the dual functionality does introduce some restrictions that are described below. The user is

responsible for ensuring that these restrictions are acceptable, otherwise the dual mode of operation may

not be applicable.

7.6.2.1 Overview of Dual Resilience

The dual Signaling Gateway solution assumes that each Signaling Gateway has one (or more) signaling links

facing the network.

The ability for each of the Signaling Gateways to communicate with each other is addressed by adding an

additional link set (containing one or two links, for example LS2 in Figure 11, “Dual Resilient Operation” on

page 145) between the two platforms. This link set is used to convey network status and management

messages between the two halves of the system and to pass signaling traffic as necessary.

On each Signaling Gateway, there is (a minimum of) two link sets, one connected to the adjacent signaling

point and the other connected to the other half of the dual pair. Each MTP route is configured so that the

primary link set is the link set connected to the adjacent signaling point and the secondary link set is the link

set connected to the partner Signaling Gateway. Load sharing across these link sets is disabled.

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