Regarding PPAs and physical interfaces

[M_107]

Hi,

Is it correct to say that the
no. of PPAs = no. of physical interfaces

where all physical interfaces may or may not be configured.

Thanks and Regards,
Mranalini

[Steven E. Protter]

I believe that statement is correct.

SEP

[M_107]

Hi,

Thanks..
I am sorry for this post in pieces..

Is there any documentation which supports this?

Thanks and Regards,
M Shetty

[Deoncia Grayson_1]

This documentation should help:

http://docs.sun.com/app/docs/doc/816-0210/6m6nb7mdf?a=view

http://devrsrc1.external.hp.com/STK/impacts/i888.html

[Stuart Abramson]

I agree with Steven.

It's true empiraclly. we only have one cable connected on this system (to the "lan1" port", but we have one PPA for each LAN port (2 x 4-port LAN cards + core port):

# lanscan
Hardware Station Crd Hdw Net-Interface NM MAC HP-DLPI DLPI
Path Address In# State NamePPA ID Type Support Mjr#
0/0/0/0 0x00306E1CD1B3 0 UP lan0 snap0 1 ETHER Yes 119
0/8/0/0/4/0 0x00306E25A528 1 UP lan1 snap1 2 ETHER Yes 119
0/8/0/0/5/0 0x00306E25A529 2 UP lan2 snap2 3 ETHER Yes 119
0/8/0/0/6/0 0x00306E25A52A 3 UP lan3 snap3 4 ETHER Yes 119
0/8/0/0/7/0 0x00306E25A52B 4 UP lan4 snap4 5 ETHER Yes 119
0/9/0/0/4/0 0x00306E255370 5 UP lan5 snap5 6 ETHER Yes 119
0/9/0/0/5/0 0x00306E255371 6 UP lan6 snap6 7 ETHER Yes 119
0/9/0/0/6/0 0x00306E255372 7 UP lan7 snap7 8 ETHER Yes 119
0/9/0/0/7/0 0x00306E255373 8 UP lan8 snap8 9 ETHER Yes 119

[rick jones]

Before the advent of Auto Port Aggregation that statement was correct. However, with the advent of APA it is no longer. There can be link aggregates defined that will take the number of PPA's beyond the number of physical interfaces.

I'm not sure if there is a flag in the interface info returned by DLPI that tells if an interface is APA or not. You could I suppose parse ioscan -fk | grep lan.

[Bill Hassell]

The best way to find all physical LAN cards is:

ioscan -knfC lan

APA will not affect ioscan's output. The -n option will show you the device files for each interface.