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Diameter Signaling Router Transport Manager
Release 8.2
E89010
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SS7+SCTP Multihomed Use Cases

Table A-2 describes Transport Manager SS7+SCTP Multihomed Use Cases.

Table A-2 SS7+SCTP Multihomed Use Cases

UC# Description
1

SCTP Multihomed Association Establishment – XSI1/XSI2 IP ports – Initiation sent via primary IP port.

Initiate and establish an outgoing SCTP multihomed association to the Adjacent Node via IP address marked as primary for both Relax and Match validation modes.

PRE CONDITIONS:
  • MP XS1 and XS2 IP addresses configured
  • SCTP association is not established
  • MP and remote Adjacent Node are each configured with two IP addresses, and each remote address is reachable via one local IP port (but both remote IP addresses are not reachable by any one local IP port)
DESCRIPTION:
  • Association is configured with both local MP addresses and addresses of Adjacent Node. One local MP address is marked as primary
  • Association is configured as an Initiator
  • Association is marked as open
  • Association generates an INIT to the Adjacent Node containing both the local addresses configured in the association via its primary interface
  • Adjacent Node responds with INIT-ACK containing both its local addresses
  • Adjacent Node's addresses are successfully validated according to validation mode and rules in SCTP Validation
  • Establishment procedure continues
POST CONDITIONS:
  • Association is accepted and established/normal. Both paths are established, and adapter traffic may now be exchanged.
ALTERNATE COURSE:
  • Validation fails and association is rejected. Refusal event is generated, refusal count is pegged, and alarm is raised.
2

SCTP Multihomed Association Establishment – XSI1/XSI2 IP ports – Initiation received via primary IP port.

Initiate and establish an incoming SCTP multihomed association to the Adjacent Node via IP address marked as primary for both Relax and Match validation modes.

PRE CONDITIONS:
  • MP XS1 and XS2 IP addresses configured
  • SCTP association is not established
  • MP and remote Adjacent Node are each configured with two IP addresses, and each remote address is reachable via one local IP port (but both remote IP addresses are not reachable by any one local IP port)
DESCRIPTION:
  • Association is configured with both local MP addresses and addresses of Adjacent Node. One local MP address is marked as primary.
  • Association is configured as an Responder
  • Association is marked as open
  • Association receives an INIT from the Adjacent Node containing both its local addresses via its primary interface
  • Association responds with INIT-ACK containing both local addresses configured in the association
  • Adjacent Node's addresses are successfully validated according to validation mode and rules in SCTP Validation
  • Establishment procedure continues
POST CONDITIONS:
  • Association is accepted and established/normal. Both paths are established, and adapter traffic may now be exchanged.
ALTERNATE COURSE:
  • Validation fails and association is rejected. Refusal event is generated; refusal count is pegged.
3

SCTP Multihomed Association Establishment – XSI1/XSI2 IP ports – Initiation sent via alternate IP port.

Initiate and establish an outgoing SCTP multihomed association to the Adjacent Node via IP address marked as alternate for both Relax and Match validation modes.

PRE CONDITIONS:
  • MP XS1 and XS2 IP addresses configured
  • SCTP association is not established
  • MP and remote Adjacent Node are each configured with two IP addresses, and each remote address is reachable via one local IP port (but both remote IP addresses are not reachable by any one local IP port)
DESCRIPTION:
  • Association is configured with both local MP addresses and addresses of Adjacent Node. One local MP address is marked as primary.
  • Association is configured as an Inhalator
  • Association is marked as open
  • Association generates an INIT to the Adjacent Node containing both the local addresses configured in the association via its alternate interface
  • Adjacent Node responds with INIT-ACK containing both its local addresses
  • Adjacent Node's addresses are successfully validated according to validation mode and rules in SCTP Validation
  • Establishment procedure continues
POST CONDITIONS:
  • Association is accepted and established/normal. Both paths are established, and adapter traffic may now be exchanged
ALTERNATE COURSE:
  • Validation fails and association is rejected. Refusal event is generated, refusal count is pegged.
4

SCTP Multihomed Association Establishment – XSI1/XSI2 IP ports – Initiation received via alternate IP port.

Initiate and establish an incoming SCTP multihomed association to the Adjacent Node via IP address marked as alternate for both Relax and Match validation modes.

PRE CONDITIONS:
  • MP XS1 and XS2 IP addresses configured
  • SCTP association is not established
  • MP and remote Adjacent Node are each configured with two IP addresses, and each remote address is reachable via one local IP port (but both remote IP addresses are not reachable by any one local IP port)
DESCRIPTION:
  • Association is configured with both local MP addresses and primary address of Adjacent Node. One local MP address is marked as primary.
  • Association is configured as an Responder
  • Association is marked as open
  • Association receives an INIT from the Adjacent Node containing both its local addresses via its alternate interface
  • Association responds with INIT-ACK containing both local addresses configured in the association
  • Adjacent Node's addresses are successfully validated according to validation mode and rules in SCTP Validation
  • Establishment procedure continues
POST CONDITIONS:
  • Association is accepted and established/normal. Both paths are established, and adapter traffic may now be exchanged.
ALTERNATE COURSE:
  • Validation fails and association is rejected. Refusal event is generated, refusal count is pegged, and alarm is raised.
5

SCTP Multihomed Association Rejection – XSI1/XSI2 IP ports – DNS SCTP association is configured as multihomed and incoming INITs contain DNS names rather IPv4 addresses.

PRE CONDITIONS:
  • MP XS1 and XS2 IP addresses configured
  • SCTP association is not established
  • MP and remote Adjacent Node are each configured with two IP addresses, and each remote address is reachable via one local IP port (but both remote IP addresses are not reachable by any one local IP port)
DESCRIPTION:
  • Association is configured with both local MP addresses and primary address of Adjacent Node. One local MP address is marked as primary.
  • Association is configured as an Responder
  • Association is marked as open
  • Association receives an INIT from the Adjacent Node containing one or more addresses as Domain Names
  • INIT is rejected
  • Establishment procedure is halted
POST CONDITIONS:
  • Association is not accepted and remains in unestablished state.
ALTERNATE COURSE:
  • None
6

SCTP Multihomed Association – Primary Path Fail.

With all paths of a multihomed SCTP association established and traffic being exchanged with the Adjacent Node, the primary path is failed.

PRE CONDITIONS:
  • Multihomed association in established state, both paths established
  • Traffic is being exchanged with the Adjacent Node
DESCRIPTION:
  • The primary path is failed
  • Traffic is moved to the alternate path
  • Event is generated indicating loss of path – Adjacent Node's primary address is marked as unavailable
  • Adjacent Node's primary address is marked as unreachable
POST CONDITIONS:
  • Association remains established although in degraded/abnormal state
  • No loss of traffic occurred
ALTERNATE COURSE:
  • None
7

SCTP Multihomed Association – Primary Path Restored.

With only the alternate path of a multihomed SCTP association established and traffic being exchanged with the Adjacent Node, the primary path is restored.

PRE CONDITIONS:
  • Multihomed association in established state, only the alternate paths established
  • Traffic is being exchanged with the Adjacent Node
DESCRIPTION:
  • The primary path is restored
  • Traffic is moved back to the primary path
  • Primary path is restored – Adjacent Node's primary address is marked as available
  • Adjacent Node's primary address is marked as reachable
POST CONDITIONS:
  • Association remains established
  • No loss of traffic occurred
ALTERNATE COURSE:
  • None
8

SCTP Multihomed Association – Alternate Path Fail.

With all paths of a multihomed SCTP association established and traffic being exchanged with the Adjacent Node, the alternate path is failed.

PRE CONDITIONS:
  • Multihomed association in established state, both paths established
  • Traffic is being exchanged with the Adjacent Node
DESCRIPTION:
  • The alternate path is failed
  • Event is generated indicating loss of path and Adjacent Node's alternate address is marked as unreachable
POST CONDITIONS:
  • Association remains established although in degraded/abnormal state
  • Traffic is unaffected
ALTERNATE COURSE:
  • None
9

SCTP Multihomed Association – Alternate Path Restored.

With only the primary path of a multihomed SCTP association established and traffic being exchanged with the Adjacent Node, the alternate path is restored.

PRE CONDITIONS:
  • Multihomed association in established state, only the primary path established
  • Traffic is being exchanged with the Adjacent Node
DESCRIPTION:
  • The alternate path is restored
  • Alternate path is restored and Adjacent Node's alternate address is marked as reachable
POST CONDITIONS:
  • Association remains established
  • Traffic is unaffected
ALTERNATE COURSE:
  • None
10

SCTP Multihomed Association – Both Paths Failure.

With all paths of a multihomed SCTP association established and traffic being exchanged with the Adjacent Node, both paths are failed.

PRE CONDITIONS:
  • Multihomed association in established state, both paths established
DESCRIPTION:
  • Both paths are failed
  • Events are generated indicating both paths failed and Adjacent Node's IP addresses are marked as unreachable. An alarm is generated indicating the Transport is down.
  • Association transitions to down state
POST CONDITIONS:
  • Association remains in down state
ALTERNATE COURSE:
  • None
11

SCTP Multihomed Association – Both Paths Restored.

With all paths of a multihomed SCTP association failed, both paths are restored.

PRE CONDITIONS:
  • Multihomed association in established state, both paths established
DESCRIPTION:
  • Both paths are failed
  • Events are generated indicating both paths failed and Adjacent Node's IP addresses are marked as unreachable. An alarm is generated indicating the Transport is down.
  • Association transitions to down state
POST CONDITIONS:
  • Association remains in down state
ALTERNATE COURSE:
  • None
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