POC2502 Series User Manual
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ports. If the packet doesn't have an 802.1Q VLAN tag, the port will not alter the packet. Thus,
all packets received by and forwarded by an untagging port will have no 802.1Q VLAN
information. (Remember that the PVID is only used internally within the Switch). Untagging is
used to send packets from an 802.1Q-compliant network device to a non-compliant network
device.
Frame Income
Frame Leave
Income Frame is
tagged
Income Frame is
untagged
Leave port is tagged
Frame remains tagged
Tag is inserted
Leave port is untagged
Tag is removed
Frame remain untagged
Table 4-5-1:
Ingress / Egress Port with VLAN VID Tag / Untag Table
■
IEEE 802.1Q Tunneling (Q-in-Q)
IEEE 802.1Q Tunneling (QinQ) is designed for service providers carrying traffic for multiple customers across their networks.
QinQ tunneling is used to maintain customer-specific VLAN and Layer 2 protocol configurations even when different customers
use the same internal VLAN IDs. This is accomplished by inserting
Service Provider VLAN (SPVLAN)
tags into the customer’s
frames when they enter the service provider’s network, and then stripping the tags when the frames leave the network.
A service provider’s customers may have specific requirements for their internal VLAN IDs and number of VLANs supported.
VLAN ranges required by different customers in the same service-provider network might easily overlap, and traffic passing
through the infrastructure might be mixed. Assigning a unique range of VLAN IDs to each customer would restrict customer
configurations, require intensive processing of VLAN mapping tables, and could easily exceed the maximum VLAN limit of
4096.
Summary of Contents for POC2502 Series
Page 1: ...1 POC2502 Series User Manual P N 1073045 REV B ISS 18MAY22...
Page 4: ...POC2502 Series User Manual 1...
Page 142: ...POC2502 Series User Manual 139 VLAN ID 3 Port 4 5 Untagged Port 6 7 Tagged Port 1 3 Excluded...
Page 283: ...POC2502 Series User Manual 280 Figure 4 10 7 IP based ACE Page Screenshot...
Page 347: ...POC2502 Series User Manual 344 No packet loss will occur...