Specifications

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OmniSwitch 6850 Series
Ethernet, 802.1q tagged ports and/or a link aggregate of ports. Initially all switch ports are non-mobile
and are assigned to VLAN 1. When additional VLANs are created on the switch, ports are assigned to
the VLANs so that traffic from devices connected to these ports is bridged within the VLAN domain.
Switch ports are either statically or dynamically assigned to VLANs.
Static port assignment applies to both mobile and non-mobile (fixed) ports. Fixed ports are also
statically assigned to secondary VLANs by defining 802.1Q tagged VLANs for the port. In addition,
ports can belong to a link aggregate of ports. Dynamic assignment applies only to mobile ports and
requires the additional configuration of VLAN rules. When traffic is received on a mobile port, the
packets are examined to determine if their content matches any VLAN rules configured on the switch.
Rules are defined by specifying a port, MAC address, protocol, network address, binding, or DHCP
criteria to capture certain types of network device traffic. It is also possible to define multiple rules for
the same VLAN. A mobile port is assigned to a VLAN if its traffic matches any one VLAN rule.
VLAN Specifications:
RFCs supported: 2674 – Definitions of Managed Objects for Bridges with Traffic Classes, Multicast
Filtering and Virtual LAN Extensions.
IEEE Standards supported: 802.1Q and 802.1D
Maximum VLANs: 1024 (including VLAN#1)
Maximum VLAN port associations: 32,768
Maximum IP router port VLANs: 1024
Maximum IPX router port VLANs: 1024
Maximum Spanning Tree VLANs: 254
Maximum Authenticated VLANs: 128
Maximum Router Mode Supported: Single
The following provides a list of various types of VLAN rules supported. Rule Types:
• DHCP
o DHCP MAC & DHCP MAC Range
o DHCP Port
o DHCP Generic
• Binding
o MAC + IP+ Port
o MAC + Port
o Port + Protocol
• MAC
o MAC address & MAC Address Range
• Mobile Tag
• Network address
o IP (IP Subnet) & IPX (IPX Network)
• Protocol [including IP, IPv6, ARP, RARP, IPX (0x8137, 0xFFFF, 0xE0E0), AppleTalk
(0x809b, 0x80F3) and DECNet]
• Port
Rule Precedence  DHCP Mac & DHCP Mac Range
 DHCP Port
 DHCP Generic
 Mac-Port-IP Binding
 Mac-Port Binding
 Port-Protocol Binding
 Mac & Mac Range
 IP Subnet
 IPX Network
 Protocol (Group Mobility classifies IPv6 frames)
Default VLAN Every switch port, mobile or non-mobile, has a configured default VLAN. Initially, this is VLAN 1 for
all ports, but is configurable using the vlan port default command.
Secondary VLANs All mobile ports start out with a configured default VLAN assignment. When mobile port traffic
matches VLAN criteria, the port is assigned to that VLAN. Secondary VLANs are any VLAN a port is
subsequently assigned to that is not the configured default VLAN for that port.
A mobile port can obtain more than one secondary VLAN assignment under the following conditions:
• Mobile port receives untagged frames that contain information that matches rules on more than one
VLAN. For example, if a mobile port receives IP and IPX frames and their is an IP protocol rule on
VLAN 10 and an IPX protocol rule on VLAN 20, the mobile port is dynamically assigned to both
VLANs. VLANs 10 and 20 become secondary VLAN assignments for the mobile port.
• Mobile port receives 802.1Q tagged frames that contain a VLAN ID that matches a VLAN that has
VLAN mobile tagging enabled. For example, if a mobile port receives frames tagged for VLAN 10, 20
and 30 and these VLANs have mobile tagging enabled, the mobile port is dynamically assigned to all
three VLANs. VLANs 10, 20, and 30 become secondary VLAN assignments for the mobile port.
Automatic VLAN Containment (AVC) When enabled, AVC prevents a port that has no VLANs mapped to an 802.1S Multiple Spanning Tree
Instance (MSTI) from becoming the root port for that instance. Such ports are automatically assigned
an infinite path cost value to make them an inferior choice for root port.