Nortel Networks 1000BASE-SX, 1000ASE-XD, 1000BASE-LX, 1000BASE-ZX VLANs spanning multiple switches

Models: 1000ASE-XD 1000BASE-ZX 1000BASE-SX 1000BASE-LX

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VLANs spanning multiple switches

60 Chapter 2 Network configuration

VLANs spanning multiple switches

You can use VLANs to segment a network within a switch. When you connect multiple switches, it is possible to connect users of one VLAN with users of that same VLAN in another switch. However, the configuration guidelines depend on whether both switches support 802.1Q tagging.

With 802.1Q tagging enabled on a port for a VLAN, all frames leaving the port for that VLAN are marked as belonging to that specific VLAN. You can assign specific switch ports as members of one or more VLANs that span multiple switches, without interfering with the Spanning Tree Protocol.

VLANs spanning multiple 802.1Q tagged switches

Figure 17 shows VLANs spanning two BayStack 420 switches. The 802.1Q tagging is enabled on S1, port 2 and on S2, port 1 for VLAN 1 and VLAN 2. Both ports are tagged members of VLAN 1 and VLAN 2.

Figure 17 VLANs spanning multiple 802.1Q tagged switches

VLAN 1

VLAN 2

BayStack

S1 VLANs spanning multiple 802.1Q tagged switchesManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background 420

Both ports are tagged members of VLAN 1 and VLAN 2

BayStack

S2 Manual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual backgroundManual background 420

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Nortel Networks 1000BASE-SX, 1000ASE-XD VLANs spanning multiple switches, VLANs spanning multiple 802.1Q tagged switches