IP Routing
6-12
8000-A2-GB21-20
November 1997
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).
97-15560-01
Router
155.1.3.1
159.1.3.1
DSL Card*
s1c
RTU 1*
135.1.3.3
155.1.3.5
ES2
s1d
RTU 2*
135.1.3.4
159.1.3.4
ES3
Packet
Flow
e1a
159.1.2.1
NSP2
159.1.2.2
Host/Net
1) 155.1.3.4
2) 155.1.3.5
3) 159.1.3.4
Subnet Mask
255.255.255.255
255.255.255.255
255.255.255.255
Next-Hop Address
155.1.3.1
155.1.3.1
159.1.3.1
S/D (Source/Destination)
src (source)
src (source)
src (source)
Partial DSL Routing Table
NSP1
155.1.2.2
155.1.2.1
155.1.3.4
ES1
Network
*If DSL card is an 8540 DSL card,
associated RTU will not have an IP address.