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CoS queues : 8 supported<br />

Last flapped : 2005-05-26 10:41:53 PDT (07:29:52 ago)<br />

Input rate : 40 bps (0 pps)<br />

Output rate : 48 bps (0 pps)<br />

SONET alarms : None<br />

SONET defects : None<br />

Logical interface so-4/0/0.0 (Index 67) (SNMP ifIndex 22)<br />

Flags: Point-To-Point SNMP-Traps Encapsulation: PPP<br />

Protocol inet, MTU: 4470<br />

Flags: None<br />

Addresses, Flags: Is-Preferred Is-Primary<br />

Destination: 192.0.4/24, Local: 192.0.4.1, Broadcast: 192.0.4.255<br />

Highlighted in this output are some of the default SONET interface settings. The<br />

link-level type is PPP, the default for interfaces with permanent virtual circuits. The<br />

default SONET media MTU for T320 routers is 4,474 bytes, and the default IPv4<br />

MTU size (displayed in the logical interface section) is 4,470 bytes. SONET interfaces<br />

uses the router’s internal stratum 3 clock as the default source of the transmit<br />

clock. The default FCS is 16 bites, and payload scrambling is enabled by default to<br />

improve link stability.<br />

To see traffic statistics and debug issues with the SONET frames, use the show<br />

interfaces extensive command:<br />

aviva@t320> show interfaces so-4/0/0 extensive<br />

...<br />

Statistics last cleared: Never<br />

Traffic statistics:<br />

Input bytes : 2981660896 40 bps<br />

Output bytes : 114715226202 48 bps<br />

Input packets: 34674367 0 pps<br />

Output packets: 1333901910 0 pps<br />

Input errors:<br />

Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0,<br />

Bucket drops: 0, Policed discards: 0, L3 incompletes: 0,<br />

L2 channel errors: 0, L2 mismatch timeouts: 0, HS link CRC errors: 0,<br />

HS link FIFO overflows: 0<br />

Output errors:<br />

Carrier transitions: 1, Errors: 0, Drops: 0, Aged packets: 0,<br />

HS link FIFO underflows: 0, MTU errors: 0<br />

Queue counters: Queued packets Transmitted packets Dropped packets<br />

0 best-effort 1333890630 1333890630 0<br />

1 expedited-fo 0 0 0<br />

2 assured-forw 0 0 0<br />

3 network-cont 11280 11280 0<br />

SONET alarms : None<br />

SONET defects : None<br />

SONET PHY: Seconds Count State<br />

PLL Lock 22 1 OK<br />

PHY Light 22 1 OK<br />

SONET section:<br />

BIP-B1 0 0<br />

234 | Chapter 7: Router Interfaces<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.

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