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Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
78-15224-02
Chapter 7 Configuring VLANs
Configuring IEEE 802.1Q VLAN Encapsulation
ML-Series switching supports up to 900 VLAN subinterfaces per card (for example, 200 VLANs on 4
interfaces uses 800 VLAN subinterfaces). A maximum of 255 logical VLANs can be bridged per card
(limited by the number of bridge-groups). Each VLAN subinterface can be configured for any VLAN ID
in the full 1–4095 range. Figure 7-1 shows a network topology in which two VLANs span two ONS
15454s with ML-Series cards.
Figure 7-1 VLANs Spanning Devices in a Network
Configuring IEEE 802.1Q VLAN Encapsulation
On an IEEE 802.1Q trunk port, all transmitted and received frames are tagged except for those on the
VLAN configured as the native VLAN for the port. Frames on the native VLAN are always transmitted
untagged and are normally received untagged. You can configure VLAN encapsulation on both the
ML100T-12 and the ML1000-2.
On an IEEE 802.1Q trunk port, all transmitted and received frames are tagged except for those on the
VLAN configured as the native VLAN for the port. On ML-series cards, the native VLAN is always
VLAN ID 1. Frames on the native VLAN are normally transmitted untagged and are normally received
untagged. Tagging of transmitted native VLAN frames can be forced by the global configuration
command vlan dot1q tag native. VLAN encapsulation is supported on both the ML100T-12 and the
ML1000-2. VLAN encapsulation is supported for routing and bridging, and is supported on Ethernet
interfaces and on POS interfaces with PPP and LEX encapsulation.
Host station
Host station
Host station
Host station
VLAN 10
VLAN 10
VLAN 2
VLAN 10
VLAN 2 VLAN 2
Fast Ethernet 3
ONS 15454
with ML100T-12
ONS 15454
with ML100T-12
83338
Fast Ethernet 1 Fast Ethernet 4
POS 0.10 POS 0. 2
Fast Ethernet 2
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