Cisco Systems IGX 8400 IMA Protocol, Two-Segment Connections, Gateway Type Routing Load Type

Universal Switching Module Enhanced

Figure 4-7shows an example of IMA protocol overhead. In the example, DS0 1 is reserved for an IMA group with 1 to 4 physical lines and DS0 2 is reserved for an IMA group with 5 to 8 physical lines.

Figure 4-7 IMA Protocol

6 1

IGX-hub

U	U
X	X
M-	M-
E	E

51

62

3

4

Trunk 8.1-4

IGX-feeder

U	U
X	X
M-	M-
E	E

6 1

29453

Supported Segment Connections on the IGX Feeder Node

Figure 4-8shows an example of configuring a two-segment connection for IGX feeder node functionality.

Figure 4-8 Sample Two-Segment Connections

B

U

X

M-

E

IGX-feeder

BNI/

BXM/ UXM-E

Routing network

A

UXM-E/
BXM	29455

Table 4-8lists the corresponding routing and feeder endpoints with applicable gateway and load types and also connection types.

Table 4-8	Two-Segment Connections
			VCC
Routing	Feeder	Connection	or		Cell
Endpoint A	Endpoint B	Type	VPC	Gateway Type	Routing	Load Type
UXM-E	UXM-E	CBR	Both	GW_TYPE_NONE	True	CBR_LOAD
BXM		RT-VBR		GW_TYPE_NONE	True	CBR_LOAD
		NRT-VBR		GW_TYPE_NONE	True	VBR_LOAD
		ABR.STD		GW_TYPE_NONE	True	ABR_LOAD
		ABRFST		GW_TYPE_NONE	True	ABR_LOAD
		UBR		GW_TYPE_NONE	True	UBR_LOAD
UXM-E	UXM-E	ATFR	N/A	GW_TYPE_NWI	N/A	BDATA_LOAD

Trunk Cards 4-17