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Page 156 / 998 Scroll up to view Page 151 - 155
Switching
Layer 2 switch functional description
iMG/RG Software Reference Manual (Switching)
2-6
FIGURE 2-1
IP packet overview
2.2.2.8 Power Conservation Mode
In order to provide longer back-up battery life during power-failure situations, some devices support a mode in
which -30 minutes after an AC Power failure is detected, all but the Lan1 interface will be powered off. This
enables the device to reduce battery consuption.
O
PREMB
7
START FRAME
1
DESTINATION
6
SOURCE
6
LENGTH/TYPE =
2
TAG CONTROL
2
MAC CLIENT
IP
IP
FRAME CHECK
2
42 - octect
TA head
MAC
IP
TO
Versio
Flag
Total
Identificati
Header
TT
Protoc
Source IP
Destination IP
Protoc
Fragment
Preceden
User
CF
D
T
R
M
Page 157 / 998
Functional Differences for Switching in Product Categories
Switching
2-7
iMG/RG Software Reference Manual (Switching)
2.2.2.9 Port Diagnostics
On some devices,
it is possible to perform diagnostics on the physical wiring that is connected to the Gateway’s
ethernet port. This is in effect a TDR mechanism - that can detect opens, shorts or good connections - and can
also determine the distance to the terminating point.
2.2.3
Functional Differences for Switching in Product Categories
The table below is intended to identify what is common amongst the product families - as well as where there
are differences - to highlite those differences. To determine which family your device belongs to - please refer to
the preface.
1.
Supports 1K MAC Addresses
2.
Supports 2K MAC Addresses
3.
Supports 4K MAC Addresses
4.
Supports 2 Queues
TABLE 2-1
Functional Mapping for Switching
Option
Fiber
A
Fiber
B
Fiber
C
Fiber
D
Fiber E
Modular
ADSL
A
ADSL
B
ADSL
C
Port Management
15
15, 12
15, 21
12, 15
12, 15,
18
12, 15, 16
15, 17
12, 15,
17
12, 15
Ingress Filtering
13
X
X
X
X
X
13
X
X
Address management
1
3
3
3
2
2
1
2
2
Rate limiting support
10
7, 14,
19
11, 14,
19
7, 14,
19
8, 9
7, 8, 9, 14,
20,
22
10
8, 9
8, 9
Loop Detection
X
X
X
Layer 3 Routing Rate Limiting
6
Quality of Service Classification
4
5
5
5
5
5
4
5
5
802.1p traffic priority
X
X
X
X
X
23
X
X
X
Differentiated services code point
(DSCP)
X
X
X
X
X
X
X
X
X
Power Conservation Mode
X
X
Port Diagnostics
X
Page 158 / 998
Switching
Functional Differences for Switching in Product
iMG/RG Software Reference Manual (Switching)
2-8
5.
Supports 4 Queues
6.
Fixed value that is not provisionable - only supported on 7x6MOD
7.
Up to thirty different rate limits are supported: 128Kbps, 256Kbps, 512Kbps, 756Kbps, 1Mbps, 1.5Mbps
2Mbps, 3Mbps, 4 Mbps, 5Mbps, 6Mbps, 7Mbps, 8Mbps, 9Mbps, 10Mbps, 12Mbps, 14Mbps, 16Mbps,
18Mbps, 20Mbps, 25Mbps 30Mbps, 35Mbps, 40Mbps, 45Mbps, 50Mbps, 60Mbps, 70Mbps, 80Mbps
and 90Mbps independently on each port and on the frame direction: Tx or Rx
8.
On non-gig capable versions - Up to seven different rate limits are supported: 128Kbps, 256Kbps,
512Kbps, 1Mbps, 2Mbps, 4 Mbps and 8Mbps independently on each port and on the frame direction: Tx
or Rx. If additional granularity or higher limits are needed, please see the section on Network Processor
Based Rate Limiting.
9.
On Non Gig capable versions - If it is necessary to rate limit TCP traffic - then it is recommended to use
the Network Processor Based Rate Limiting. Rate Limiting in the RX direction can result in packet loss -
which results in lower throughput than configured for TCP sessions.
10.
Rate limiting on these devices is based on 64Kb granularity - the user is able to enter values between 0
and 100Mbps
11.
Rate limiting on these devices is based on 64Kb granularity - the user is able to enter values between 0
and 100Mbps.
12.
Coax Mode is not supported.
13.
When assigning VLANs - these ports can be defined as TAGGED or UNTAGGED - it is not possible to
support both.
14.
Supports BroadCast Rate Limiting and MultiCast Rate Limiting
15.
Ports supported are from Lan1 up to a max of LAN6 - depending on the number of Ethernet ports avail-
able.
16.
Additional ports can be present depending on the Module added - for example hpna - if the HPNA Lan
module is present; CESC and CESD if the T1/E1 Circuit emulation module is present; Glan if the Gig
WAN Module is present. All these ports can be managed like a normal LAN port - but it is not recom-
mended that any changes be made to the CESC port.
17.
It is possible ot use the LAN4 port as a WAN port.
18.
It is possible to use the LAN6 port as a Wan port - if the Fiber port is not being used.
19.
Supported Rate Limits for Broadcast and multicast data are 3.5%, 5%, 10% and 20% or the total port
capacity.
20.
On Gig Enabled devices, Supported Rate Limits for Broadcast and Multicast data are
128Kbps,
256Kbps, 512Kbps, 756Kbps, 1Mbps, 1.5Mbps, 2Mbps, 3Mbps, 4Mbps, 5Mbps, 6Mbps, 7Mbps,
8Mbps, 9Mbps, 10Mbps 12Mbps, 14Mbps, 16Mbps, 18Mbps, 20Mbps, 25Mbps, 30Mbps, 35Mbps,
40Mbps, 45Mbps, 50Mbps, 60Mbps, 70Mbps, 80Mbps, 90Mbps.
21.
Supports FLOW
and JAMMING Control of flow-control options.
22.
On Gig Ports the same rates are supported below 100Mbps. In addtion the following rates are sup-
ported: 100Mbps, 150MBps, 200Mbps, 250Mbps, 300Mbps, 350MBps, 400Mbps, 450Mbps,
500Mbps, 600Mbps, 700Mbps, 800Mbps, 900Mbps.
Page 159 / 998
Switch command reference
Switching
2-9
iMG/RG Software Reference Manual (Switching)
23.
For 6x6MOD and 7x6MOD devices when 802.1P is Disabled, the P-Bit Setting on any received
packet is converted to 0. So if a packet is received with a P-Bit setting of 3 - the P-Bit of the packet
when transmitted is 0. To assist in managing the implications of this - the default setting for the
WAN and the CPU port
802.1p port attributes is Enabled.
2.2.4
Switch command reference
This section describes the commands available on configure and manage switch ports and the address look up
table.
Throughout are references back to
2.2.3
2.2.4.1 Switch CLI commands
The table below lists the
switch
commands provided by the CLI:
TABLE 2-2
Switch
commands
Commands
Fiber
A
Fiber
B
Fiber
C
Fiber
D
Fiber
E
Modular
ADSL
A
ADSL
B
ADSL
C
SWITCH DIAGNOSE PORT
X
SWITCH DISABLE AGEINGTIMER
X
X
X
SWITCH DISABLE LEARNING
X
X
X
SWITCH DISABLE LOOPDETECTION
X
X
X
SWITCH DISABLE PORT
X
X
X
SWITCH ENABLE AGEINGTIMER
X
X
X
SWITCH ENABLE LEARNING
X
X
X
SWITCH ENABLE LOOPDETECTION
X
X
X
SWITCH ENABLE PORT
X
X
X
SWITCH LIST PORTS
X
X
X
X
X
X
SWITCH RESET
X
X
X
X
X
X
X
X
X
SWITCH RESET COUNTERS
X
X
X
SWITCH RESET PORT
X
X
X
X
X
X
X
X
X
SWITCH SET 802.1P PRIORITY
X
SWITCH SET AGE-TIMER
X
X
X
X
X
X
Page 160 / 998
Switching
Switch command reference
iMG/RG Software Reference Manual (Switching)
2-10
SWITCH SET AGING-TIME
X
X
X
X
X
X
SWITCH SET AGINGTIMER
X
X
X
SWITCH SET LEARNING
X
X
X
X
X
X
SWITCH SET LOOPDETECTION
X
X
X
SWITCH SET PORT 802.1P
X
X
X
X
X
X
SWITCH SET PORT BROADCASTLIMIT
X
X
X
X
SWITCH SET PORT DEFAULTPRIORITY
X
X
X
X
X
X
X
X
X
SWITCH SET PORT DEFAULTVID
X
X
X
X
X
X
X
X
X
SWITCH SET PORT DSCP
X
X
X
X
X
X
SWITCH SET PORT DSCP/NODSCP
X
X
X
SWITCH SET PORT FLOW
X
X
SWITCH SET PORT FLOWCONTROL
X
X
X
X
X
X
SWITCH SET PORT INFILTERING
X
X
X
X
X
X
X
X
X
SWITCH SET PORT MULTICASTLIMIT
X
X
X
X
SWITCH SET PORT QOS/NOQOS
X
X
X
SWITCH SET PORT RCVLIMIT
X
X
X
X
X
X
X
X
X
SWITCH SET PORT RCVLIMIT-HIGH
X
X
SWITCH SET PORT RCVLIMIT-LOW
X
X
SWITCH SET PORT SPEED
X
X
X
X
X
X
X
X
X
SWITCH SET PORT STATUS
X
X
X
X
X
X
SWITCH SET PORT TRSLIMIT
X
X
X
X
X
X
X
X
X
SWITCH SET PORT TRSLIMIT-HIGH
X
X
SWITCH SET PORT TRSLIMIT-LOW
X
X
SWITCH SET PORT TRSLIMIT-HIGH
X
X
X
SWITCH SET QOS 802.1P
X
X
X
X
X
X
SWITCH SET QOS DSCP
X
X
X
X
X
X
TABLE 2-2
Switch
commands
(Continued)
Commands
Fiber
A
Fiber
B
Fiber
C
Fiber
D
Fiber
E
Modular
ADSL
A
ADSL
B
ADSL
C

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