Ip Addresses On Mlp-Enabled Links - Cisco 10000-2P2-2DC Software Configuration Manual

Chapter 22 Configuring Multilink Point-to-Point Protocol Connections
Table 22-2
Command
multilink bundle-name authenticated
multilink bundle-name endpoint
multilink bundle-name both

IP Addresses on MLP-Enabled Links

Configuring an IP address on a link used for MLP does not always work as expected. For example,
consider the following configuration:
interface Serial 1/0/0
You might expect the following behavior as a result of this configuration:
•
•
Instead, if a link with an IP address configured comes up and joins a bundle, IP installs a route directly
to that link interface and it might try to route packets directly to that link, bypassing the MLP bundle.
This behavior occurs because IP considers an interface to be up for IP traffic whenever IP is configured
on the interface and the interface is up. MLP intercepts and discards these misdirected frames. This
condition occurs frequently if you use a virtual template interface to configure both the PPPoX member
links and the bundle interface.
OL-2226-23
Bundle Name Generation
ip address 10.2.3.4 255.255.255.0
encapsulation ppp
ppp multilink
If the interface does not negotiate to use MLP and the interface comes up as a regular PPP link, then
the interface negotiates the Internet Protocol Control Protocol (IPCP) and its local address is
10.2.3.4.
If the interface did negotiate to use MLP, then the configured IP address is meaningless because the
link is not visible to IP while it is part of a bundle. The bundle is a network-level interface and can
have its own IP address, depending on the configuration used for the bundle.
IP Addresses on MLP-Enabled Links
Bundle Name Generation Algorithm
The bundle name is the peer's username, if
available.
If the peer does not provide a username, the
algorithm uses the peer's endpoint discriminator.
The authenticated keyword specifies that
Note
the bundle name is based on whatever
notion of a username the system can
derive. The endpoint discriminator is
ignored entirely, unless it is the only name
that can be found.
The multilink bundle-name authenticated
command is the default naming policy.
The bundle name is the peer's endpoint
discriminator.
If there is no endpoint discriminator, the
algorithm uses the peer's username.
The name of the bundle is a concatenation of the
username and the endpoint discriminator.
Cisco 10000 Series Router Software Configuration Guide
22-7