[nsp] PA-1GE=: Packet discard

[Noriega, Alejandro]

I'm studying this problem with the TAC, but they didn't mention anything
about the limits of the PA-1GE=
Yesterday I upgraded my 7200 up to 12.2(19) and disabled the flowcontrol
'on the other end'. Today I already have ignored and overruns but I have
not more output drops.

WS-C3508G-XL <-----> PA-GE:7204VXR:I/O-GE+E <-----> WS-X4912G

Have anyone knows the real limits of the PA-1GE=?

Thanks for your answer Brad.

Alejandro.

-----Original Message-----
From: Roldan, Brad [mailto:BRoldan at Covad.COM] 
Sent: Tuesday, September 16, 2003 9:08 PM
To: Noriega, Alejandro
Subject: RE: [nsp] PA-1GE=: Packet discard


Alejandro,

   I'm sure if you ask Cisco for the performance characteristics for the
PA-1GE cards, you'll find that you are hitting the upper limits of their
performance. Flow control on your GigE links is unlikely to help. The
reason is that the receiving side (your 7200) will send our "Pause"
frames telling the sending side to slow down. The sending side may
ignore the pause frames, or try to buffer the frames. At some point, you
will probably overrun the sending side buffer, leaving you in the same
predicament you find yourself in now.

   Try making sure that whatever is connected to gige0/0 has flow
control enabled.

Regards,

Brad


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Noriega,
Alejandro
Sent: Tuesday, September 16, 2003 2:43 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] PA-1GE=: Packet discard
Importance: High


Hello folks,
	I have a 7204VXR (NPE400 - 256MB) with a C7200-I/O-GE+E and a
PA-1GE=. I'm using both GE and both interfaces are handling more than
180Mbps (in/out). The problem I have is that the PA-1GE= drops a lot of
packets and have a lot of ignored and overruns (which cause a heavily
latency on my network) but the GE (on the I/O) is Ok !. I was checking
the configuration of both interfaces and the unique difference that I
found was the flow control settings.

The if which drops packets:

GigabitEthernet2/0 is up, line protocol is up 
  Hardware is WISEMAN
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 39/255, rxload 45/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex mode, link type is autonegotiation, media type is SX
  output flow-control is on, input flow-control is unsupported
  5 minute input rate 176652000 bits/sec, 57516 packets/sec
  5 minute output rate 154467000 bits/sec, 42975 packets/sec
!
The if which doesn't drop packets:

GigabitEthernet0/0 is up, line protocol is up 
  Hardware is i82543 (Livengood)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 45/255, rxload 39/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex mode, link type is autonegotiation, media type is SX
  output flow-control is off, input flow-control is off
  5 minute input rate 154216000 bits/sec, 42761 packets/sec
  5 minute output rate 176668000 bits/sec, 57372 packets/sec

Anyone have any idea of which is the most recommended settings for GE
interfaces (in general)? What about the flow control?

Thanks a lot !

Regards,
Alejandro.

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