Configuring Vlan - 3Com 3CBLSF26PWRH User Manual

Item
Fragments
Jabbers
Collisions
Frames of 64 Bytes
Frames of 65 to 127
Bytes
Frames of 128 to
255 Bytes
Frames of 256 to
511 Bytes
Frames of 512 to
1023 Bytes
Frames of 1024 to
1522 Bytes

Configuring VLAN

VLANs are logical subgroups with a Local Area Network (LAN) which combine user stations and
network devices into a single unit, regardless of the physical LAN segment to which they are attached.
VLANs allow network traffic to flow more efficiently within subgroups. VLANs use software to reduce the
amount of time it takes for network changes, additions, and moves to be implemented. VLANs restrict
traffic within the VLAN.
VLANs have no minimum number of ports, and can be created per unit, per device, or through any other
logical connection combination, since they are software-based and not defined by physical attributes.
VLANs function at Layer 2. Since VLANs isolate traffic within the VLAN, a Layer 3 router working at a
protocol level is required to allow traffic flow between VLANs. Layer 3 routers identify segments and
coordinate with VLANs. VLANs are Broadcast and Multicast domains. Broadcast and Multicast traffic is
transmitted only in the VLAN in which the traffic is generated.
VLAN tagging provides a method of transferring VLAN information between VLAN groups. VLAN1 is
the default VLAN and always contains untagged ports. All ports are members of VLAN1 by default. If the
untagged port is moved to a new VLAN, the port is removed from VLAN1. For example: If an untagged
port 24 is moved to VLAN 5. The port will no longer be a member of VLAN1. However, if the port is
added to VLAN5 as a tagged port it then remains untagged in VLAN1.
This section contains the following topics:
Creating VLANs
Modifying VLAN
Modifying Port VLAN Settings
Displays the number of fragments (packets with less than 64 octets,
excluding framing bits, but including FCS octets) received on the interface
since the switch was last refreshed
Displays the total number of received packets that were longer than 9216
octets. This number excludes frame bits, but includes FCS octets that had
either a bad Frame Check Sequence (FCS) with an integral number of octets
(FCS Error) or a bad FCS with a non-integral octet (Alignment Error)
number. The field range to detect jabbers is between 20 ms and 150 ms.
Displays the number of collisions received on the interface since the switch
was last refreshed.
Displays the number of 64-byte frames received on the interface since the
switch was last refreshed.
Displays the number of 65 to 127 byte frames received on the interface since
the switch was last refreshed
Displays the number of 128 to 255 byte frames received on the interface
since the switch was last refreshed.
Displays the number of 256 to 511 byte frames received on the interface
since the switch was last refreshed.
Displays the number of 512 to 1023 byte frames received on the interface
since the switch was last refreshed.
Displays the number of 1024 to 1522 byte frames received on the interface
since the switch was last refreshed.
3-18
Description