Arris NVG599 Administrator'S Handbook Download Page 129

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| out-link-oid | icmp-type ]

Matches on the following categories:

set gfs name filterset_name rule number match number value [ value (category-
specific) ]

Queue Commands

Queue configuration typically requires a classification component to set a QoS marker to a packet and a
queueing component to schedule the marked packets to the link. This is accomplished using filter sets (

“Filter

Set Commands” on page 124

The basic queue's size and length are controls for how many packets and total bytes can be enqueued before it
is considered to be full. Once it is full, any attempts to enqueue another packet will result in a “tail-drop.”

Both constraints are simultaneously used, such that the queue is full when either packet count

byte count

exceeds the limit. This allows flexibility in obtaining a balance, where a large number of small packets, but only
a small number of large packets can be enqueued.

If there are no tail-drops – that is, the queue is not blocked from sending and doesn't over-fill and dump
packets – then these queue size/bytes parameters do not affect anything. Their only function is to adjust the
threshold at which the queue is considered full, which dictates when tail-drops will occur. So if there are no
tail-drops, then increasing the queue length will have no effect. Increasing the queue length has no effect
unless there are tail-drops.

The maximum size/bytes of a queue balances how much burstiness can be buffered versus having a queue that
is simply too long.

Burstiness smoothing

requires queueing up the buffers. For example, if the upstream line rate is 1 mbps, but

the traffic source sends 100 mbps bursts for 10 ms every second (which coincidentally averages 1 mbps) then

src-ip-addr

(ip[4|6] address or subnet spec (type ip4 or ip6 only))

dst-ip-addr

(ip[4|6] address or subnet spec (type ip4 or ip6 only))

ip-proto

(0-255 or iana-defined string equivalents)

src-port

(1-65535[:1-65535], only if

ip-proto

== TCP or UDP)

dst-port

(1-65535[:1-65535], only if

ip-proto

== TCP or UDP)

tcp-flags

(only if

ip-proto

== TCP)

icmp-type

(only if

ip-proto

== ICMP or IPv6 ICMP)

src-host-mac

(MAC address of src)

dst-host-mac

(MAC address of dest)

in-link-oid

(oid of ingress link oid)

out-link-oid

(oid of egress link oid)

NOTE:

A rule cannot contain data that specifies both IPv6 and IPv4 at the same time, and thus be applicable to nei-
ther

iptables

nor

ip6tables

; however, a rule can be IP-version agnostic, in which case it will be applied to both

iptables

and

ip6tables

, given the proper conditions. For instance, if a LAN-side device has both an IPv4

address and a routable IPv6 address, then one can specify a rule for this device by referring to its MAC
address, and if no other match attributes of the rule preclude its use in both tables, the rule will be applied to
both

iptables

and

ip6tables

(given the assumption that the LAN Host Discovery database contains both

addresses).