Foundry Configuration Guide for the FESX, FSX, and FWSX
11 - 50
© Foundry Networks, Inc.
December 2005
the packet. The tag contains the tag value, which identifies the data as a tag, and also contains the VLAN ID of the
VLAN from which the packet was sent. The tag and VLAN ID keep traffic from each VLAN segregated and private.
•
FESX releases prior to 01.1.00 enable you to configure a single 802.1Q tag type on all ports on the device.
The default 802.1Q tag on a Foundry device is 8100 (hexadecimal), compliant with the 802.1Q specification.
Figure 11.18 shows an 802.1Q configuration example with a single 802.1Q tag type.
Figure 11.18
802.1Q Configuration Example
As shown in Figure 11.18, the ports to customer interfaces are untagged, whereas the uplink ports to the
provider cloud are tagged, because multiple client VLANs share the uplink to the provider cloud. In this
example, the Foundry device treats the customer’s private VLAN ID and 8100 tag type as normal payload,
and adds the 9100 tag type to the packet when the packet is sent to the uplink and forwarded along the
provider cloud.
As long as the switches in the provider’s network are Foundry devices or devices that can use the 9100 tag
type, the data gets switched along the network. However, devices along the provider’s cloud that do not
support the 9100 tag type may not properly handle the packets.
•
FESX releases 01.1.00 and later, and all FSX and FWSX releases, provide finer granularity for configuring
802.1Q tagging, enabling you to configure 802.1Q tag-types on a group of ports. This type of configuration is
called
802.1Q-in-Q tagging
.
This feature enables the creation of two identical 802.1Q tags (802.1Q-in-Q
tagging) on a single device. This enhancement improves SAV interoperability between Foundry devices and
other vendors’ devices that support the 802.1Q tag-types, but are not very flexible with the tag-types they
accept.
Figure 11.19 shows an example application with 802.1Q-in-Q tagging.
Figure 11.19
802.1Q-in-Q Configuration Example
In Figure 11.19, the untagged ports (to customer interfaces) accept frames that have any 802.1Q tag other
than the configured tag-type 9100. These packets are considered untagged on this incoming port and are re-
tagged when they are sent out of the uplink towards the provider. The 802.1Q tag-type on the uplink port is
8100, so the Foundry device will switch the frames to the uplink device with an additional 8100 tag, thereby
supporting devices that only support this method of VLAN tagging.
Provider Edge Switch
Uplink to provider cloud
To customer interface
Untagged
Tagged
DA
SA
9100
Provider
VLAN
8100
Customer
VLAN
DA
SA
8100
Customer
VLAN
Provider Edge Switch
Uplink to provider cloud
To customer interface
Untagged
Tagged
DA
SA
8100
Customer
VLAN
DA
SA
8100
Provider
VLAN
8100
Customer
VLAN
Default tag-type 8100
Configured tag-type 9100
Содержание FastIron Edge Switch X424
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