Chapter 31 Layer 2 Protocol Tunneling
GS2220 Series User’s Guide
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Point to Point The Switch supports PAgP (Port Aggregation Protocol), LACP (Link Aggregation Control
Protocol) and UDLD (UniDirectional Link Detection) tunneling for a point-to-point topology.
Both PAgP and UDLD are Cisco’s proprietary data link layer protocols. PAgP is similar to LACP
and used to set up a logical aggregation of Ethernet ports automatically. UDLD is to determine
the link’s physical status and detect a unidirectional link.
PAGP Select this option to have the Switch send PAgP packets to a peer to automatically negotiate
and build a logical port aggregation.
LACP Select this option to have the Switch send LACP packets to a peer to dynamically create and
manage trunk groups.
UDLD Select this option to have the Switch send UDLD packets to a peer’s port it connected to
monitor the physical status of a link.
Mode Select Ac c e ss to have the Switch encapsulate the incoming layer 2 protocol packets and
forward them to the tunnel ports. Select Ac c e ss for ingress ports at the edge of the service
provider's network.
Note: You can enable L2PT services for STP, LACP, VTP, CDP, UDLD, PAgP, and LLDP on
the access ports only.
Select Tunne l for egress ports at the edge of the service provider's network. The Switch
decapsulates the encapsulated layer 2 protocol packets received on a tunnel port by
changing the destination MAC address to the original one, and then forward them to an access
port. If the services is not enabled on an access port, the protocol packets are dropped.
Apply Click App ly to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Sa ve link on the top navigation panel to save
your changes to the non-volatile memory when you are done configuring.
Cancel Click Ca nc e l to begin configuring this screen afresh.
Table 142 Advanced Application > Layer 2 Protocol Tunneling (continued)
LABEL DESCRIPTIO N
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