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304 BigIron RX Series Configuration Guide
53-1001810-01
Configuring 802.1q tag-type translation
11
Figure 29 shows a more complex example application in which some ports are untagged, not all
tag-types between devices match, and the core devices have multiple tag-types. In this example,
the tag-type translation feature integrates packets that have single and double tag-types.
FIGURE 29 802.1q tag-type translation configuration example 2
As illustrated in Figure 29 , the devices process the packets as follows:
•
Path A: When Core Switch 1 receives the tagged packet from Edge Switch 1, it keeps the 8500
tag-type in the frame header (because the incoming port on Core Switch 1 is untagged) and
adds the 9100 tag-type as it sends the packet to the uplink (Core Switch 2). In this case, the
packet is double-tagged as it travels between the core devices.
•
Path B: When Core Switch 1 receives the tagged packet from Edge Switch 2, it removes the
8200 tag-type and replaces (translates) it with the 9100 tag-type as it sends the packet to the
uplink (Core Switch 2).
For more information, refer to “Configuring 802.1q tag-type translation” on page 302.
Configuration rules
•
On the supported devices, you configure 802.1q tag-types per port region. Use the show
running-config command at any level of the CLI to view port regions. Note that on Gigabit
Ethernet modules, ports 1 and 2 belong to the same port region.
Edge Switch 2 Edge Switch 3
Edge Switch 1
Core Switch 1 Core Switch 2
Edge Switch 4
8200 8200
8500 8500 8400 9100 9100 8400
8200
8300
8200
8300
T
T
T
T
U
T
T
T U
T
T
Global 802.1Q
tag-type
8200
Global 802.1Q
tag-type
8200
Global 802.1Q
tag-type
8500
Multiple
802.1Q
tag-types
Multiple
802.1Q
tag-types
Global 802.1Q
tag-type
8500
Path A
Path B
Incoming Frame
on Core Switch 1 Outgoing Frame
on Core Switch 1 Outgoing Frame
on Core Switch 2
DA SA 8500 Customer
VLAN
DA SA 8200 Customer
VLAN
DA SA 9100 Provider
VLAN
DA SA 9100
Provider
VLAN
8500
DA SA 8500 Customer
VLAN
DA SA 8200 Customer
VLAN
T - Tagged port
U - Untagged port
DMA or port group
Path A
Path B
-
XXXX
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