# Creating IPv6 Mroute Port Limits

When a multicast forwarding entry (that is, an mroute) is added with an OIF on a port, the OIF count for that port is incremented. If you configure a port limit and the OIF count on the port count exceeds that limit, no OIFs on that port are added to mroutes (that is, new OIFs are blocked).

To configure a limit on the number of mroute OIFs that can be added across different virtual routers on a port:

- Issue the mroute port limit command in Global Configuration mode.
  host1(config)#mroute port 3/0 limit 10

Use the no version to remove any OIF port limits.

#### Related Documentation

- Before You Begin
- Monitoring IPv6 Multicast Forwarding Entries
- Monitoring Active IPv6 Multicast Routes
- Monitoring Multicast Routes on Virtual Router Ports
- Monitoring Join Interface Details when IPv6 OIF Mapping is Configured
- Monitoring IPv6 Multicast Statistics
- mroute port limit