Cisco 10000 - Manual (Page 266)

9-8
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 9 Configuring Multihop
Configuration Examples for Multihop
Configuration Examples for Multihop
The example in this section is a multihop configuration in which the Cisco 10000 router is configured
as the multihop system (MH). The example includes LAC and LNS configurations to complete the
configuration. This configuration scenario supports a maximum of two
hops between the LAC device
and the destination LNS device.
Figure 9-2 shows the example multihop configuration, described in more detail in the list that follows.
Figure 9-2 Multihop Configuration Example
The remote client dials in to the LAC. The LAC negotiates link control protocol (LCP) and
preauthenticates the user.
5. The LAC configuration sets up a vpdn-group named tunnel1. This vpdn-group initiates a tunnel to
IP address 30.1.1.2 to request dialin connection for any packets associated with the cisco.com
domain. The local name of tunnel1 is LAC1. This is the name by which tunnel1 identifies itself to
the receiving end of the L2TP tunnel.
6. The Cisco 10000 router acts as the multihop system (MH). On the LAC side, the MH configuration
requires users to log in to the system. The MH configuration creates a vpdn-group named multihop0,
which identifies the L2TP tunnel terminating from the LAC. The multihop0 tunnel only accepts
dialin connections from the LAC and identifies itself by using the local name Home Gateway 1
(HGW1).
7. On the LNS side, the MH configuration creates a vpdn-group named multihop1, which initiates an
L2TP tunnel to the LNS at IP address 31.1.1.2. The multihop1 vpdn-group requests dialin
connections to the LNS based on the LAC’s hostname. Using the multihop hostname LAC1
command creates the association between the LAC and the LNS devices. Like multihop0, multihop1
shares the same HGW1 local name.
8. The LNS configuration sets up a vpdn-group named tunnel1, which accepts dialin connections from
the MH system. The tunnel1 vpdn-group terminates the L2TP tunnel from the MH system (identified
by the HGW1 local name) and uses the local name LNS1 to identify itself. The LNS configuration
creates a virtual template interface named Virtual-Template1, which it associates with tunnel1.
Virtual-Template1 uses PAP authentication and assigns the IP address by using the local IP address
pool named pool-1.
LAC Configuration
!
vpdn enable
!
vpdn-group tunnel1
request-dialin
protocol l2tp
domain cisco.com
initiate-to ip 30.1.1.2 priority 1
Client
LAC
30.1.1.2 31.1.1.2
(MH) Cisco
1000 ESR
87102
1 5 4 3 2
Tunnel 1
Lac 1
Multihop 0
HGW 1
Multihop 1
HGW 1
Tunnel 1
LNS 1
Virtual Template 1
Access network
(ATM or Ethernet)
LNS