Cisco Systems 8600 Series manual Useful Default Allocations

				Tag Switching Resource Configuration Parameters
Table 9-2	Port Connection Allocations
		cnfrsrc
		cmd
Connection Type		parameter	Variable	Description
AutoRoute LCNs		maxpvclcns	a(x)	Represents the number of AutoRoute (PVC) LCNs
				configured for a port.
Minimum VSI LCNs		minvsilcns	n1(x)	Represents the guaranteed minimum number of LCNs
for partition 1				configured for the port VSI partition. This value is not
				necessarily always available. Reaching it is dependent
				on FIFO access to the unallocated LCNs in the port
				group common pool.
Maximum VSI LCNs		maxvsilcns	m1(x)	Represents the maximum number of LCNs configured
for partition 1				for the port VSI partition. This value is not necessarily

reached. It is dependent on FIFO access to the unallocated LCNs in the port group common pool.

(where x is the port number, and subscript “1” is the partition number)

AutoRoute is guaranteed to have its assigned connection spaces (LCNs) available. Tag switching, uses one connection space (LCN) per Tag VC (TVC). This is usually one connection space (LCN) per source-destination pair using the port where the sources and destinations are tag edge routers.

Beyond the guaranteed minimum number of connection spaces (LCNs) configured for a port VSI partition, a tag switching partition uses unallocated LCNs on a FIFO basis from the common pool shared by all ports in the port group. These unallocated LCNs are accessed only after a port partition has reached its guaranteed minimum limit, “minvsilcns”, as configured by the cnfrsrc command.

Useful Default Allocations

Reasonable default values for all ports on all cards are listed in Table 9-3.If these values are not applicable, then other values may be configured using the cnfrsrc command.

Table 9-3 Port Connection Allocations, Useful Default Values

		Useful
		Default
Connection Type	Variable	Value	cnfrsrc cmd parameter
AutoRoute LCNs	a(x)	256	maxpvclcns
Minimum VSI LCNs for partition 1	n1(x)	512	minvsilcns
Maximum VSI LCNs for partition 1	m1(x)	16384	maxvsilcns
			Different types of BXM cards
			support different maximums. If
			you enter a value greater than
			the allowed maximum, a
			message is displayed with the
			allowable maximum.

Here, a(x) = 256, n1(x) = 512, and m1(x) = 16384.

The next section describes more rigorous allocations which may be configured in place of using these default allocations.

Tag Switching 9-13