 | Copyright © 2009, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
MX-series routers can support both Layer 3 and Layer 2 functions at the same time. For example, you can configure the Layer 3 multicast protocols Protocol Independent Multicast (PIM) and the Internet Group Membership Protocol (IGMP) as well as Layer 2 VLANs on the MX-series router. In many cases, Layer 2 protocols run on some interfaces, and Layer 2 protocols run on others.
Normal encapsulation rules restrict Layer 2 processing to accessing information in the frame header and Layer 3 processing to accessing information in the packet header. However, in some cases, an interface running a Layer 2 protocol needs information available only at Layer 3. For example, in multicast applications, the VLANs need the group membership information and multicast tree information available to the Layer 3 IGMP and PIM protocols. In these cases, the Layer 3 configurations can use PIM or IGMP snooping to provide the needed information at the VLAN level.
Snooping configuration statements and examples are not included in this configuration guide. For more information about configuring PIM and IGMP snooping, see the JUNOS Multicast Configuration Guide.
| Copyright © 2009, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |