Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

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Interface Specifiers
The majority of the configuration task examples in this topic collection use the slot / port
format to specify an interface. However, the interface specifier format that you use
depends on the router that you are using.
For ERX7xx models, ERX14xx models, and ERX310 routers, use the slot / port format.
For example, the following command specifies an ATM interface on slot 0, port 1 of
an ERX7xx model, ERX14xx model, or ERX310 router.
host1(config)# interface gigabitEthernet 0/1
For E120 and E320 routers, use the slot / adapter / port format, which includes an
identifier for the bay in which the I/O adapter (IOA) resides. In the software, adapter
0 identifies the right IOA bay (E120 router) and the upper IOA bay (E320 router);
adapter 1 identifies the left IOA bay (E120 router) and the lower IOA bay (E320
router). For example, the following command specifies a10-Gigabit Ethernet interface
on slot 5, adapter 0, port 0 of an E320 router.
host1(config)# interface tenGigabitEthernet 5/0/0
Related Topics
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For more information about supported interface types and specifiers on E Series
routers, see Interface Types and Specifiers.
QoS Terms
Table 3 on page 5 defines terms used in this discussion of QoS.
Table 3: QoS Terminology
Description Term
Bandwidth guaranteed until the node below in the scheduler
hierarchy is oversubscribed. Assured rate
Network forwards as many packets as possible in as reasonable a
time as possible. This is the default per-hop behavior (PHB) for packet
transmission. Best effort
For a logical interface, the queue associated with the best-effort
traffic class for that logical interface, Best-effort queue
The scheduler node associated with a logical interface and traffic
class group pair, and where the traffic class group contains the
best-effort traffic class. Also known as best-effort node. Best-effort scheduler node
Cell delay variation. Measures the difference between a cell’s
expected and actual transfer delay. Determines the amount of jitter. CDV
Cell delay variation tolerance. Specifies the acceptable tolerance of
CDV (jitter). CDVT
QoS Terms
■ 5
Chapter 1: Quality of Service Overview