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User Guide for Cisco Security Manager 4.4
OL-28826-01
Chapter 59 Configuring Router Interfaces
PPP on Cisco IOS Routers
As shown in Figure 59-3, traffic routed across an MLP link is fragmented, with the fragments being sent
across the different physical links. At the remote end of the link, the fragments are reassembled and
forwarded to the next hop toward their ultimate destination. By using multiple physical links, MLP
provides a way to temporarily use the additional bandwidth afforded by these links.
Figure 59-3 Multilink PPP
Every MLP bundle is controlled by a single interface, the bundle master, which is a virtual-access
interface. This interface is created in the background when the bundle is first created. The physical
interface becomes part of the bundle that is managed by the bundle master. Bundles are also used when
you create a multilink group consisting of a multilink interface and its associated serial interfaces, which
is a setup that is often found in static, leased-line environments.
MLP uses an endpoint discriminator to identify the system transmitting a packet. By default, this
discriminator is based on the hostname of the router, but it can also be based on other criteria, such as
the IP address or MAC address of the interface, a telephone number, or a user-defined string. If the
endpoint discriminator matches the discriminator of an existing link, the new link is added to the
matching bundle. If no match exists, a new bundle is created. When authentication is used, a new bundle
is established whenever there is a mismatch in either the discriminator or the authentication information
exchanged between the two nodes.
Related Topics
• Defining Multilink PPP Bundles, page 59-74
• PPP on Cisco IOS Routers, page 59-70
Defining PPP Connections
When you define a PPP connection, the first step is to select the interface on which PPP should be
enabled. You must select one of the following interface types:
• Async
• Group-Async
• Serial
• High-Speed Serial Interface (HSSI)
• Dialer
• BRI, PRI (ISDN)
• Virtual template
Bundle of four T1's
Cisco 2500
Cisco 7200
Cisco 2500
T3
180727