Chapter 6 Configuring the System
Configuring MVR
6-52
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-05
c. The maximum number of mvr entries is determined by the switch
hardware. Each MVR group represents a TV channel.
d. Enter the mvr command to enable MVR. You do not need to reconfigure
the MVR groups. The switch uses the MVR groups when you re-enable
MVR.
• Each channel is one multicast stream destined for a unique IP multicast
address.
• Make sure the router is statically configured to forward multicast traffic for
the MVR groups to the switch. The router should not depend on IGMP join
requests from hosts (forwarded by the switch) to forward multicast traffic to
the switch.
• The receiver VLAN is the VLAN to which the first configured receiver port
belongs. If the first receiver port is a dynamic port with an unassigned VLAN,
it becomes an inactive receiver port and does not take part in MVR unless it
is assigned to the receiver VLAN. The receiver VLAN is reset whenever there
are no remaining receiver ports on the switch (active or inactive), which
means that the receiver VLAN might change every time the first receiver port
is configured.
MVR implementation has the following limitations:
• MVR is supported on only modular Catalyst 2900 XL switches.
• Unknown multicast packets, unknown unicast packets, and broadcast packets
are leaked from the multicast VLAN to the receiver ports.
• MVR does not support IP-address aliasing and therefore requires that each IP
multicast address maps to only one Layer 2 MAC address. In MVR, you
cannot configure multiple IP addresses that map to the same MAC address.
• The same multicast MAC addresses cannot belong to both CGMP and MVR
groups. CGMP does not dynamically learn addresses that are MVR group
members. If you want CGMP to learn an address that is already an MVR
group member, remove the address from the MVR group.
Conversely, you cannot add an address to an MVR group if it is already a
CGMP group member. If you want an address that is already a CGMP group
member to be an MVR group member, remove the address from the CGMP
group, and then statically add it to the MVR group. For information about
CGMP, see the “Controlling IP Multicast Packets through CGMP” section on
page 6-46.
To Next Page
Loading...
