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Page 231 / 998 Scroll up to view Page 226 - 230
Bridge command reference
BRIDGE
2-81
iMG/RG Software Reference Manual (Switching)
Options
The following table gives the range of values for each option that can be specified with
this command and a default value (if applicable).
Example
--> bridge show interface bridge1 trafficclassmap
Bridge Interface: bridge1
Number of Traffic Classes: 8
--------------------------
Regenerated| Traffic
Priority
| Class
-----------|--------------
0 | 0
1 | 1
2 | 2
3 | 3
4 | 4
5 | 5
6 | 6
7 | 7
See also
BRIDGE SET INTERFACE ACCEPTFRAMETYPE
BRIDGE SET INTERFACE DEFAULTUSERPRIORITY
BRIDGE SET INTERFACE NUMTRAFFICCLASSES
BRIDGE SET INTERFACE REGENPRIORITY
BRIDGE LIST INTERFACES
2.3.4.1.55 BRIDGE SHOW INTERFACESTATS
Syntax
BRIDGE SHOW INTERFACESTATS { < name > | < number > }
Description
This command displays the statistical information of one bridge interface configured by
the user.
•
Rx Frames: Number of frames received on the interface.
•
Tx Frames: Number of frames transmitted from the interface.
Name
Description
Default Value
Name
A name that identifies an existing bridge interface. To dis-
play interface names, use the bridge list interfaces com-
mand.
N/A
Number
A number that identifies an existing bridge interface. To
display interface names, use the bridge list interfaces com-
mand. The number appears in the first column under the
heading ID.
N/A
Page 232 / 998
BRIDGE
Bridge command reference
iMG/RG Software Reference Manual (Switching)
2-82
•
Transmit Delay Discards: Number of frames discarded due to transmit delay.
•
Unknown VLAN Discards: Number of frames discarded due to unknown VLAN
•
Buffer O/F Discards: Number of frames discarded due to buffer overflow.
•
Ingress Discards: Number of frames discarded due to ingress filtering.
•
Frame Type Discards: Number of frames discarded due to the acceptable frame type
setting on the interface.
Options
The following table gives the range of values for each option that can be specified with
this command and a default value (if applicable).
Example
--> bridge show interfacestats 1
Bridge Interface: ethernet0
Rx Frames|Tx Frames|Transmit
|Unknown VLAN|Buffer O/F|Ingress |Frame Type
|
|Delay Discards|Discards
|Discards
|Discards|Discards
---------|---------|--------------|------------|----------|--------|----------
3686117
|3236443
|0
|0
|0
|0
|0
------------------------------------------------------------------------------
See also
BRIDGE ADD INTERFACE
BRIDGE ATTACH
BRIDGE LIST INTERFACE STATS
2.3.4.1.56 BRIDGE SHOW MCASTENTRY SHARED
Syntax
BRIDGE SHOW MCASTENTRY SHARED {<entryname>| <entrynumber>)
{<fdbname>| <fdbnumber>)
Description
This command displays a statically configured multicast Forwarding entry with the given
name in the named Forwarding Database.
Options
T
he following table gives the range of values for each option that can be specified with
this command and a default value (if applicable)
Name
Description
Default Value
Name
The name manually assigned to the object when it was cre-
ated..
N/A
Number
The numerical identifier automatically assigned to the
object when it was created.
N/A
Page 233 / 998
Bridge command reference
BRIDGE
2-83
iMG/RG Software Reference Manual (Switching)
Example
bridge show mcasten try shared MCAST_1 DefaultFdb
Mcast Entry Name:MCAST_1
MAC Address:01:00:00:00:00:00
Egress Interfaces:bridge1
Description
BRIDGE CLEAR MCASTENTRIES SHARED
BRIDGE ADD MCASTENTRY SHARED
BRIDGE DELETE MCASTENTRY SHARED
2.3.4.1.57 BRIDGE SHOW UCASTENTRY
Syntax
BRIDGE SHOW UCASTENTRY {<entryname>| <entryn umber>) {<fdbname>|
<fdbn umber>)
Description
This command displays information about a statically configured, unicast filtering entry for
a given filtering database. The fields are listed below:
•
User Entry NameUser-configured filtering entry name.
•
TypeType, indicating if it is a source MAC address or destination MAC address based
filtering entry
•
TypeEthernet MAC address associated with the entry.
•
MAC AddressEthernet MAC address associated with the entry.
Name
Description
Default Value
entryname
Name of an existing Multicast Forwarding Entry. To dis-
play the list of all statically configured multicast entries,
that the user can delete, use
bridge list static mcasten-
tries.
This command also displays the entire egress interface
list for that entry.
entrynumber
A number that identifies an existing Multicast Forwarding
Entry. To display the list of statically configured multicast
entries, use
bridge list static mcastentries.
The number
appears in the first column under the heading ID.
fdbname
The name of an existing Forwarding Database. See
bridge add
vlan
CLI command to configure a new Filtering Database.
fdbnumber
A number that identifies an existing Forwarding Database.
To display the list of FDBs, use the
bridge list fdbs
com-
mand. The number appears in the first column under the
heading ID.
Page 234 / 998
VLAN
Overview
iMG/RG Software Reference Manual (Switching)
2-84
•
Receive InterfaceReceive interface for source MAC address based entries. See the
bridge add ucastentry src for more information.
•
Egress InterfacesEgress interface list.
Options
T
he following table gives the range of values for each option that can be specified with
this command and a default value (if applicable).
Example
bridge show ucastentry UCAST_1 FDB_1
Output Ucast Entry Name: UCAST_1
Type:
Dest Static
MAC Address:00:00:00:00:00:01
Receive Interface:
Egress Interfaces:
See also
BRIDGE ADD UCASTENTRY SRC
BRIDGE ADD UCASTENTRY DEST
2.4
VLAN
2.4.1
Overview
VLAN is a networking technology that allows networks to be segmented logically without having to be physi-
cally rewired.
Name
Description
Default Value
entryname
A name that identifies an existing unicast forwarding entry. To
display the list of statically configured unicast entries, use
bridge list static ucastentries.
This command also displays
the egress interface list for each unicast entry.
entrynumber
A number that identifies an existing unicast forwarding entry.
To display the list of statically configured unicast entries, use
bridge list static ucastentries.
The number appears in the
first column under the heading ID.
fdbname
The name of an existing filtering database to which the filter-
ing entry will be added. See Note on filtering database in
this command.
fdbn umber
A number that identifies an existing Filtering Database. To
display the list of FDBs, use the
bridge list fdbs
command.
The number appears in the first column under the heading
ID.
Page 235 / 998
Overview
VLAN
2-85
iMG/RG Software Reference Manual (Switching)
Many Ethernet switches support virtual LAN (VLAN) technologies. By replacing hubs with VLAN switches, the
network administrator can create a virtual network within existing network. With VLAN, the network logical
topology is independent of the physical topology of the wiring. Each computer can be assigned a VLAN identifi-
cation number (ID), and computers with the same VLAN ID can act and function as though they are all on the
same physical network.
So, the traffic on a VLAN is isolated and thus all communications remain within the VLAN. The assignment of
VLAN IDs is done by the switches and can be managed remotely using network management software.
VLAN switches can function in different ways. They can be switched at the data-link layer (layer 2 of the Open
Systems Interconnection reference model) or the network layer (layer 3), depending on the type of switching
technology used. The main advantage of using VLAN technologies is that users can be grouped together accord-
ing to their need for network communication, regardless of their actual physical locations. This isolation will
help to reduce unnecessary traffic so better network performance. The disadvantage is that additional configu-
ration is required to set up and establish the VLANs when implementing these switches.
2.4.1.1 VLAN tagging
VLAN technology introduces the following three basic types of frame:
•
Untagged frames
•
Priority-tagged frames
•
VLAN-tagged frames
An untagged frame or a priority-tagged frame does not carry any identification of the VLAN to which it belongs.
Such frames are classified as belonging to a particular VLAN based on parameters associated with the receiving
port.
This classification mechanism requires the association of a specific VLAN ID, the Port VLAN Identifier, or PVID,
with each of the switch ports.
The PVID for a given port provides the VID for untagged and priority-tagged frames received through that port.
The PVID for each port shall contain a valid VID value, and shall not contain the value of the null VLAN ID (see
Table 8)
A VLAN-tagged frame carries an explicit identification of the VLAN to which it belongs; i.e., it carries a non-null
VID. Such a frame is classified as belonging to a particular VLAN based on the value of the VID that is included
in the tag header. The presence of a tag header carrying a non-null VID means that some other device, either
the originator of the frame or a VLAN-aware switch, has mapped this frame into a VLAN and has inserted the
appropriate VID.
Tagging of frames is performed for the following purposes:
•
To allow user priority information to be added to frames carried on IEEE 802 LAN MAC types that have no
inherent ability to signal priority information at the MAC protocol level;
•
To allow a frame to carry a VID;

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