Nortel Networks 5510, 5520, 5530 3.3 Port Range Functionality

Filters and QoS Configuration for ERS 5500

Technical Configuration Guide v2.0 NN48500-559

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External Distribution

Filter example:

a) IP Class ifier #1: src IP = 10.1.1.0/24

b) IP Class ifier #2: src IP = 10.20.0.0/16

c) IP Classifier #3: src IP = 172.1.1.0/24

d) IP Class ifier #4: src IP = 10.22.0.0/16

e) IP Class ifier #5: src IP = 10.1.2.0/24, dst IP = 192.1.1.0/24

f) IP Classifier #6: src = 10.1.10.0/24

Classifiers a, c and f can be combined to create a classifier block if you wish to filter on these

addresses on a port(s). Classifiers b and d can be combined to create a sec ond classifier block if

you wish to filter on these addresses on a port(s).

3.3 Port Range Functionality

The Ethernet Routing Switch 5500 has the ability to specify a range of values supported by the

QoS data model for several classification components (e.g., Layer 4 so urce and destination port

numbers, VLAN Id values). Range support is limited to a certain exte nt, however, because ranges

are represented as a bitmask within the overall classification m ask, and not with explicit minimum

and maximum values. A range must thus be specified by indicat ing which bits in the given field

(e.g., Layer 4 source port) are ‘ignored’ (i.e., set to 0). Taking into account th is limitation, the

following rules are used to determine valid range values:

I. Minimum value: n

Maximum value: n

>> Example: min: 20 max: 20 (min = max equates to a range of 1)

II. Minimum value: 0

Maximum value: (2^n) – 1

>> Example: min: 0 max: 63 (n = 6)

III. Minimum value: even number

Maximum value: minimum port number in binary with rightmost consec utive 0’s replaced

with 1’s using the formula: Port Maximum = ((Port minimum + 2 n) -1)) where n equal

number of consecutive trailing zero’s.

>> Example: min: 128 max: 255 ((128 + 27) – 1 = 255; 128 in binary has 7 consecutive

trailing zero’s)

Specified ranges that do not adhere to one of these three rules cannot b e supported and

will be flagged as erroneous.

The following table shows some examples of valid port ranges supporte d on the Ethernet Routing

Switch 5500.

Table 2: Example of Valid Port Ranges

Minimum Value (must

be even number) Maximum Value Binary Value

0 1, 3, 7, 15, 31, 63, 127,

255, 511, 1025, 2047,

4095, 8191, 16355,

32762, or 65535

2 3 Min = 10