Cisco Systems IGX 8400 Series Betriebsanweisung PDF herunterladen (Seite 28)

3-28 Cisco IGX 8400 Series Installation and Configuration

Making Frame Relay Connections

This section outlines how to establish Frame Relay service by setting up a universal frame module

(UFM) or a Frame Relay module (FRM). The information includes details for T1, E1, HSSI, V.35,

and X.25 interfaces. Detailed descriptions of the Frame Relay commands appear in the Cisco WAN

SwitchingCommandReference.Speciﬁccablingrequirements for the UFI back cardsontheUFM-U

appear in the UFM-U description in the Cisco IGX 8400 Series Reference.

Maximum Connections Per Port with Signalling Protocols

For any Frame Relay card set that has a maximum frame length of 4510 bytes, the type of signaling

protocol you can (optionally) specify with cnffrport results in a limit on the number of connections

per physical or logical port. The maximum number of connections per port for each protocol is:

• For Annex A: 899

• For Annex D: 899

• For StrataLMI: 562

Neither addcon nor cnffrport prevents you from adding more than the maximum number of

connections on a port. (You might, for example, use cnffrport to specify an LMI when too many

connections for that particular LMI already exist.) If the number of connections is exceeded for a

particular LMI, the LMIdoes not work on the port, the fullstatus messages that result are discarded,

and LMI timeouts occur on the port. A port failure results and also subsequently leads to a-bit

failures in other segments of the connection path.

Setting Up Frame Relay on a UFM

Channelized and unchannelized versions of the UFM card sets exit. The channelized front cards

UFM-4C and UFM-8C operate with T1 and E1 interfaces,and the unchannelized front card UFM-U

operates with V.35, X.21, and HSSI interfaces.

The back cards have the following terminations:

• The UFI-8T1-DB-15 has 8, female, subminiature DB-15s.

• The UFI-8E1-DB-15 has 8, female, subminiature DB-15s.

• The UFI-8E1-BNC has 16 BNC connectors, 1 for each direction.

• The UFI-12V.35 has 6 low-force helix (LFH) connectors with 2 ports per connector.

• The UFI-12X.21 has 6 low-force helix (LFH) connectors with 2 ports per connector.

• The UFI-4HSSI has 4 connectors.

If the installation includes Y-cable redundancy, ﬁrst read the section “Y-Cable Redundancy on the

UFMs.”

Y-Cable Redundancy on the UFMs

Redundancy for a Frame Relay port is possible with a second card set and the appropriate Y-cable.

The card redundancy kit for UFM contains a second UFM/UFI card set and Y-cables to interconnect

the ports on the two back cards. The forthcoming section titled “Setting Up Frame Relay Ports and

Connections (UFM)” includes the step for conﬁguring Y-cable redundancy.

Refer to the cabling description in the UFM-U section of the Cisco IGX 8400 Series Reference for

descriptions and part numbers of all cables for unchannelized UFMs.

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Cisco Systems IGX 8400 Series Betriebsanweisung Seite 28