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Management Domain Packet Walk-Through
Packet Walk-Through Using an 8546 DSL Card
Service Domain Packet Walk-Through
8000-A2-GB21-20
6. The 8540 DSL card then consults its routing table to identify the next hop to
forward the packet. Since a host route is defined for ES1 (route #2), the DSL
interface is used as the next hop.
7. The 8540 DSL card then forwards the packet over the DSL port to that RTU.
8. Upon receiving the packet, the RTU forwards the packet to its 10BaseT port.
For an 8540 DSL card and its associated RTUs, all management functions are
performed by an agent on the DSL card.
To examine how data packets flow through the service domain, an example of
ES1 issuing a ping to NSP1 will be used. The following assumptions are made:
A host route entry has been configured in the HotWire RTU for ES1
A source domain IP entry exists for the HotWire RTU
A static route exists between the 8546 DSL card and the HotWire RTU
Filtering is disabled
The following illustration shows how data packets flow through the service
domain. In this illustration ES1 is connected to the same LAN as the HotWire
RTU.
7
Router
NSP1
155.1.2.2
155.1.2.1
155.1.3.1
1
2
NSP1 issues reply to ping
Partial DSL Routing Table
Host/Net
Subnet Mask
1) 155.1.3.4
255.255.255.255
2) 155.1.3.4
255.255.255.255
November 1997
6
Unnumbered
8546 DSL
DSL
Card
Interface
155.1.3.2
6
3 4
5
7
Next-Hop Address
155.1.3.1
135.1.3.3
Packet Walk-Throughs
ES1 pings NSP1
4
3
2
1
5
RTU
ES1
135.1.3.3
155.1.3.4
8
S/D (Source/Destination)
src (source)
dst (destination)
97-15474a
9-3
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