Minimum/Maximum Bandwidth Qos Mode - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Ethernet IP Module Interface
The following table can be used as a reference for some well known Port numbers:
Port Description
1 TCP Port Service Multiplexer (TCPMUX)
7 ECHO
20 FTP - Data
21 FTP - Control
22 SSH Remote Login Protocol
23 Telnet
25 Simple Mail Transfer Protocol (SMTP)
42 Host Name Server (Nameserv)
53 Domain Name System (DNS)
69 Trivial File Transfer Protocol (TFTP)
70 Gopher Services
80 HTTP
108 SNA Gateway Access Server
109 POP2
110 POP3
115 Simple File Transfer Protocol (SFTP)
Once the QoS Rules are defined, each type of traffic flow should be isolated and sent
to verify that it is being sent in the intended QoS Rule.

13.4.5.2 Minimum/Maximum Bandwidth QoS Mode

QoS Rules can be assigned to up to 32 different types of flows to be user-defined. Flows can be
defined by any combination of Protocol (FTP, UDP, RTP, etc.), Source/Destination IP (specific
or range), and/or Layer 3 Source/Destination Port.
Weighted Random Early Detection (WRED) – The Min/Max BW QoS mode allows selection
of Weighted Random Early Detection (WRED).
WRED allows for more graceful dropping of packets as QoS queues get full. Typically, without
WRED, packets are dropped based upon a simple tail drop algorithm that is applied to packets as
they are being added to the QoS queues. This can result in large numbers of contiguous packets
being dropped, which causes many protocols such as RTP and TCP to ungracefully degrade
performance in a over-consumed or bursty scenario. WRED applies a randomization, which
means that the percentage change to drop packets increases as the queue becomes full, and
minimizes the chances of global synchronization. Thus, WRED allows the transmission line to be
used fully at all times.
Maximum Bandwidth – This can be assigned to a flow to restrict the Maximum Bandwidth that
any particular flow will utilize; otherwise, the default of no bandwidth restriction can be selected.
Port Description
118 SQL Services
119 Newsgroup (NNTP)
137 NetBIOS Name Service
139 NetBIOS Datagram Service
150 NetBIOS Session Service
156 SQL Server
161 SNMP
179 Border Gateway Protocol (BGP)
190 Gateway Access Control Protocol (GACP)
197 Directory Location Service (DLS)
396 Novell Netware over IP
443 HTTPS
444 Simple Network Paging Protocol (SNPP)
546 DHCP Client
547 DHCP Server
1080 Socks
13–14
Revision 12
MN/CDM570L.IOM