Zte zxmsg 5200 Technical Manual page 54

ZXMSG 5200 (V2.0.2) Multiplex Service Gateway Technical Manual
42 Confidential and Proprietary Information of ZTE CORPORATION
F 1 8 – 8 0 2 1 . Q I
I G U R E D E N T I F I C A T I O N
VLAN trunking:
The VLANs can communicate with each other via the trunking
connection between the two switches using the router. It
allows multiple VLANs on one port or a group of ports. It
allows a single network adapter to behave as 'n' number of
virtual network adapters. 'n' has a theoretical upper limit of
4096 but is typically limited to 1000 VLAN network
segments.
To implement VLAN trunking different 802.1Q tags are affix
to the same port or same group of ports. The messages of
different VLANs are identified and VLAN interconnection is
possible.
SVLAN:
SVLAN solves the 4096 VLAN limitation. It allows a stack of
two or more 802.1Q headers to be carried in an Ethernet
frame. The number of VLANs is extended to more than 16
million (4096 * 4096). At the same time multiple VLANs can
be multiplexed within a single core VLAN (the top .1Q tag).
Spanning Tree expansion allows fast convergence (in the
order of 1 sec). However, SVLANs only provide a partial
solution. If customers are given the option to define their
own VLAN ID spaces, the core of the network remains limited
to 4096 VLANs. Figure 19 explains the SVLAN concept.
M
E T H O D S