Cisco 10000-2P2-2DC Software Guide - Page 485

Chapter 22 Configuring Multilink Point-to-Point Protocol Connections IP Addresses on MLP-Enabled Links Table 22-2 Bundle Name Generation Command multilink bundle-name authenticated multilink bundle-name endpoint multilink bundle-name both 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. Note The authenticated keyword specifies that 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. 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 ip address 10.2.3.4 255.255.255.0 encapsulation ppp ppp multilink You might expect the following behavior as a result of this configuration: • 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. 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 Cisco 10000 Series Router Software Configuration Guide 22-7