IP Routing
6-4
8000-A2-GB21-20
November 1997
DSL Card Static Route Example
The following illustration shows an example of how static routes configured on a
DSL card are used in its routing table:
97-15471-02
Router
155.1.2.1/
255.255.0.0
155.1.3.1/
255.255.255.0
NSP
155.1.2.2/
255.255.0.0
DSL Card*
155.1.3.2/
255.255.0.0
RTU*
135.1.3.3
MCC Card
135.1.3.1/
255.255.0.0
135.1.2.2/
255.255.0.0
Unnumbered
DSL
Interface
ES
155.1.3.4
Host/Net
1) 155.1.3.4
2) 135.1.2.0
3) 0.0.0.0
Subnet Mask
255.255.255.255
255.255.255.0
0.0.0.0
8546 DSL
Card Next-
Hop
Address
135.1.3.3
135.1.3.1
155.1.3.1
S/D (Source/
Destination)
dst (destination)
dst (destination)
dst (destination)
DSL Routing Table
*If DSL card is an 8540 DSL card,
associated RTU will not have an IP address.
8540 DSL
Card Next-
Hop
Address
s1c
135.1.3.1
155.1.3.1
s1c
Ethernet
Interface
NMS
PA
(Proxy
ARP)
Y (yes)
N (no)
N (no)
In this example:
The DSL card’s Ethernet port is connected to the router’s port, which has an
IP address of 155.1.3.1.
Packets being routed in the upstream direction (to an NSP) would use the
third routing table entry; i.e.,
Host/Net IP address 0.0.0.0 (by definition) and a
Next Hop address of 155.1.3.1.
They would use this route because no other destination would match.
The management domain IP address of the RTU is 135.1.3.3 and the IP
address of the ES is 155.1.3.4. Packets being routed downstream use the
first routing table entry, i.e.,
Host/Net IP address of 155.1.3.4 and a Next Hop
address of 135.1.3.3. Note that this is a host route.
The second routing table entry is for upstream routing to the NMS via the
MCC card. Note that this is a subnet route.
