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IP Routing
Network
6-12
The following illustration shows the packet flow when ES1 sends to ES3, ES1
and ES3 are in different service domains, and source-based routes are defined
for ES1 and ES2 (indicated by the S/D flag).
NSP1
155.1.2.2
155.1.2.1
Router
155.1.3.1
e1a
159.1.3.1
159.1.2.1
159.1.2.2
*If DSL card is an 8540 DSL card,
NSP2
associated RTU will not have an IP address.
Partial DSL Routing Table
Host/Net
Subnet Mask
1) 155.1.3.4
255.255.255.255
2) 155.1.3.5
255.255.255.255
3) 159.1.3.4
255.255.255.255
November 1997
DSL Card*
RTU 1*
s1c
135.1.3.3
RTU 2*
135.1.3.4
s1d
Next-Hop Address
155.1.3.1
155.1.3.1
159.1.3.1
ES1
155.1.3.4
Packet
Flow
ES2
155.1.3.5
ES3
159.1.3.4
S/D (Source/Destination)
src (source)
src (source)
src (source)
97-15560-01
8000-A2-GB21-20
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