7-8 Smart Switch 1800 4. 0 User Guide , Rev 0 1
will be allocated 60/130 (46%) of the available bandwidth, and Group 2 will be allo-
cated 70/130 (54%).
Group "n" Excess Priority
determines the order in which groups are given their allocations of bandwidth; the
higher the number, the higher the priority.
Group "n" Use Excess Burst
will (if Y) allow traffic that falls into the Excess Burst Size to be transmitted. Any
packets exceeding BE will be buffered in the SmartSwitch.
Configuration Example
Here is an example of a typical bandwidth allocation group configuration:
This configuration ensures that SNA traffic, which is very time-sensitive, will be
given top priority, and will all be transmitted within the guaranteed 30% of the band-
width, eliminating the risk of discarded packets. Sequenced arrival of packets is not
critical among the first three groups, so those types of traffic can be configured to
allow transmission above the Committed Information Rate (CIR) (described on page
7-18). (Traffic above CIR is transmitted with the Discard Eligibility bit set, whic h
allows packets to be discarded if necessary.)
Table 7-2 Ban dwidth Alloc ation E xampl e
Group Used For Percenta ge Excess P riori ty U se Exc ess Bu rst
1SNA 30 16 N
2Logical Ports & Mgmt. 20 15 Y
3IP 30 14 Y
4IPX 20 13 Y