how i know the PORT ID in 7750 to use snmp

[avivi]

i need to use the port id of port in 7750 for snmp request .

SNMPv2-SMI::enterprises.6527.3.1.2.4.3.6.1.1.X.Y.Z
where x = service id
y = port id
z= vlan
can some one tell me how can i calculate the y ( port id ) base on 7750 ?
if i have port 1/2/5 , how can i calculate the value of y ?

[ripnet]

You could poll ifName. (1.3.6.1.2.1.31.1.1.1.1)

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iso.3.6.1.2.1.31.1.1.1.1.37912576 = STRING: "1/2/5"

[rekeds]

the user manual says thats is in binary.
use the freaking search, this has been discussed so many times here in the forum.

[mivens]

Also, the definition of TmnxPortID in the MIBs explains how you can calculate it:

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TmnxPortID ::= TEXTUAL-CONVENTION
    STATUS  current
    DESCRIPTION
        "A portid is an unique 32 bit number encoded as shown below.

            32 30 | 29 26 | 25 22 | 21 16 | 15  1 |
            +-----+-------+-------+-------+-------+
            |000  |  slot |  mda  | port  |  zero | Physical Port
            +-----+-------+-------+-------+-------+

So port 1/2/5 i.e. slot 1, mda 2, port 5 would be in binary (adding whitespace for readability):
000 0001 0010 000101 000000000000000 which is 37912576 in decimal