Configuring Aggregated Vlans - Foundry Networks FESX Manual

Figure 11.17 Example Super Aggregated VLAN Application
Client 1 Client 3
Port 1/1 Port 1/3
VLAN 101 . . . VLAN 103
Client 1
192.168.1.69/24
Ports 1/1 - 1/5
Untagged
Device A
Tag Type 8100
Device E
Tag Type 8100
192.168.1.129/24
In this example, a collocation service provides private channels for multiple clients. Although the same devices
are used for all the clients, the VLANs ensure that each client receives its own Layer 2 broadcast domain,
separate from the broadcast domains of other clients. For example, client 1 cannot ping client 5.
The clients at each end of a channel appear to each other to be directly connected and thus can be on the same
sub-net and use network services that require connection to the same sub-net. In this example, client 1 is in sub-
net 192.168.1.0/24 and so is the device at the other end of client 1's channel.
Since each VLAN configured on the core devices is an aggregate of multiple client VLANs, the aggregated VLANs
greatly increase the number of clients a core device can accommodate.
This example shows a single link between the core devices. However, you can use a trunk group to add link-level
redundancy.

Configuring Aggregated VLANs

To configure aggregated VLANs, perform the following tasks:
• On each edge device, configure a separate port-based VLAN for each client connected to the edge device. In
each client VLAN:
• Add the port connected to the client as an untagged port.
• Add the port connected to the core device (the device that will aggregate the VLANs) as a tagged port.
December 2005
Client 5
Port 1/5
. . . VLAN 105
209.157.2.12/24
Port 2/1
Tagged
Port 3/1
Untagged
Device C
VLAN Aggregation
Tag Type 9100
Enabled
Port 4/1
Tagged
Device D
VLAN Aggregation
Tag Type 9100
Enabled
Port 3/1
Untagged
Port 2/1
Tagged
Ports 1/1 - 1/5
Untagged
© Foundry Networks, Inc.
Configuring Virtual LANs (VLANs)
Client 6
Port 1/1
. . .
VLAN 101
Port 2/1
Tagged
Port 3/2
Untagged
Port 4/1
Tagged
Port 3/2
Untagged
Port 2/1
Tagged
Ports 1/1 - 1/5
Untagged
Client 10
Client 8
Port 1/5
Port 1/3
VLAN 103 . . . VLAN 105
Ports 1/1 - 1/5
Untagged
Device B
Tag Type 8100
Device F
Tag Type 8100
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