Tuesday, September 21, 2010

Ethernet Encapsulation


By default, an Ethernet uses ARPA encapsulation (standard Ethernet Version 2.0). However, you can specify another encapsulation type using the encapsulation command. For example:
interface ethernet 0

   encapsulation arpa

   ip address 10.10.1.10 255.255.255.248
The possible encapsulation types are shown in Table 5-3.

Table 5-3. Ethernet encapsulation types
Keyword
Encapsulation type
arpa
Standard Ethernet Version 2.0
isol
IEEE 802.3 Encapsulation
snap
IEEE 803.3 Encapsulation per RFC 1042
All the devices connected to an Ethernet must share the same encapsulation type; if they do not, they will not be able to communicate. If you're not sure of the encapsulation type, you're probably using ARPA.

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