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3. Configuring the DSL Router
3-2 November 2003 6300-A2-GB20-10
Ethernet Interface
— The Ethernet interface is a 10/100BaseT interface that automatically
negotiates the rate to be used, 10 Mb or 100 Mb. If all Ethernet-attached
devices are capable of operating at 100 Mb, the router defaults to 100 Mb.
Otherwise, it operates at 10 Mb.
— The interface can be configured for either DIX or IEEE 802.3 frame format.
When configured to use IEEE 802.3 format, SNAP encapsulation is used,
as specified in RFC 1042.
— The interface has a unique MAC address, assigned before the router is
shipped.
— Hotwire 6302 IDSL and 6342 SDSL Routers have a hub configuration
(separate pins for input and output) with four Ethernet connectors. The
hub acts as a bit-level repeater, with the four Ethernet interfaces logically
appearing as one Ethernet communications interface with a single
collision domain.
— In router mode, the router only accepts transmissions on the Ethernet
interface with the interface’s MAC address, or a broadcast or multicast
MAC address.
— In bridge mode, the router accepts all transmissions. This is the default
setting.
Interface Identifiers
The following conventions are used for naming router interfaces:
dsl1 (or d0) – Identifier for the DSL interface.
eth1 (or e0) – Identifier for the Ethernet interface.
With exception to primary status, an interface cannot be deleted or changed as
long as there is a declared route that uses the interface.
Service Domain IP Address Assignments
Hotwire DSL Routers support multiple service domains.
Service domains are defined by the configured network addresses and subnet
masks using the CLI.
Up to four service domain IP addresses and subnet masks can be assigned to
each DSL (dsl1) or Ethernet (eth1) interface.
When a numbered interface is designated as the primary interface, that interface’s
IP address is used as the Router ID. If no interface is designated as the primary
interface, the last numbered interface that was created becomes the Router ID.