Atm Virtual Connection - Planet GRT-101 User Manual

PLANET Technology Corp. GRT-101/401/402 User's Manual

3.12.2 ATM virtual connection

There are two types of ATM connections: (1) virtual paths, identified by virtual
path identifiers (VPI); and (2) virtual circuit, identified by the combination of a
VPI and a virtual circuit identifier (VCI). Also, there are two encapsulation
methods for carrying bridged and routed PDUs in the payload field of ATM
adaptation layer (AAL) type 5, which are defined in RFC 1483, multi-protocol
encapsulation over AAL 5. The LLC encapsulation method multiplexes multiple
protocols on a single ATM virtual circuit. Each protocol is identified in the 802.2
LLC header of the packet. The VC based multiplexing method carries each
protocol on a separate ATM virtual circuit. This method is sometimes used in
private networks, in which PVC creation is very economical.
Note: Each VC is expressed as WAN x, where x is a number between 1 and 8. GRT-101/GRT-401/GRT-402 comes
pre-configured with one ATM VC (WAN 1 with VPI/VCI = 0/32) already established. The WAN 1 port is ready to send
and receive network traffic via IPoA protocol with LLC encapsulation. You may need to modify the pre-configured ATM
VC when communicating across your local ISP network.
For bridging mode operation, you should select Ethernet over ATM (RFC 1483
bridged Ethernet) as the ATM protocol. For routing mode operation,
GRT-101/GRT-401/GRT-402 supports Ethernet over ATM (RFC 1483 bridged
Ethernet), IP over ATM (RFC 1483 routed IP/RFC 1577), PPP over ATM (RFC
2364), and PPP over Ethernet (RFC 2516). The following example enables the
ATM VC WAN 3 with protocol of Ethernet over ATM:
admin# setup wan 3 protocol Ethernet
where the selectable parameters corresponding to the above ATM protocols
are "Ethernet", "IPoA", "PPPoA", and "PPPoE". To disable the pre-configured
ATM VC WAN 1, enter:
admin# setup wan 1 protocol Disable
The valid ranges for the VPI is from 0 to 255. For the VCI, it is between 0 and
65535.
The following example set the VPI/VCI = 0/135 for ATM VC WAN 3
admin# setup wan 3 vpi_vci 0 135
To change the encapsulation from default LLC to VC-Mux for ATM VC WAN 3
admin# setup wan 3 encap VC-Mux
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