5-3 - Implement Intranet MVPN

Question 1

T/F: With an intranet MVPN, all the multicast clients are located in different organizations.

Answer 1

False. With an intranet MVPN, all the multicast clients are located within the same organization.

Question 2

Describe the process of multicast packet forwarding, in a nutshell.

Answer 2

The sending host inserts the multicast group address into the IP destination address field of the packet, and IP multicast routers and multilayer switches forward incoming IP multicast packets out all interfaces that lead to members of the multicast group. Any host, regardless of whether it is a member of a group, can send to a group. However, only the members of a group receive the message.

Question 3

Describe what is happening in this configuration:

Device> enable
Device# configure terminal
Device(config)# ip multicast-routing distributed
Device(config)# ip multicast-routing vrf vrf1 distributed
Device(config)# vrf definition vrf1
Device(config-vrf)# mdt default 232.0.0.1

Answer 3

• Configuring the default MDP Group for a VRF
• used for customer control plane and low-rate data plane traffic
• connects all the PE routers with MVRFs in a particular multicast domain
• one will exist in every multicast domain, even if no source is active in the respective customer network.
• The default MDT group must be the same group that you configure on all devices that belong to the same VPN.
• This address serves as an identifier for the MVRF community, because all provider-edge (PE) routers that are configured with this same group address become members of the group, which allows them to receive the PIM control messages and multicast traffic that other members of the group send.

Question 4

Describe what’s happening with this configuration.

Device> enable
Device# configure terminal
Device(config)# router bgp 65535
Device(config-router)# address-family ipv4 mdt
Device(config-router-af)# neighbor 192.168.1.1 activate
Device(config-router-af)# neighbor 192.168.1.1 send-community extended
Device(config-router-af)# exit
Device(config-router)# address-family vpnv4
Device(config-router-af)# neighbor 192.168.1.1 activate
Device(config-router-af)# neighbor 192.168.1.1 send-community extended

Answer 4

• This example illustrates the process for configuring an MDT address family session on PE devices to establish MDT peering sessions for MVPNs.

Question 5

Describe what’s happening with this configuration.

Device> enable
Device# configure terminal
Device(config)# vrf definition vrf1
Device(config-vrf)# mdt data 239.192.20.32 0.0.0.15 threshold 1
Device(config-vrf)# mdt log-reuse
Device(config-vrf)# end

Answer 5

• Configure the Data Multicast Group
• The following elements are part of this configuration:
  *group_address: Multicast group address. The address can range from 224.0.0.1 to 239.255.255.255, but cannot overlap the address that has been assigned to the default MDT.
  *wildcard_bits: Wildcard bit mask to apply to the multicast group address to create a range of possible addresses. You can limit the maximum number of data MDTs that each MVRF can support.
  *threshold threshold_value: (Optional) Defines the threshold value in kilobits, at which multicast traffic should be switched from the default MDT to the data MDT. The threshold_value parameter can range from 1 through 4294967 kilobits.
  *list access_list: (Optional) Specifies an access list name or number to be applied to this traffic.
• A data MDT group can include a maximum of 256 multicast groups per VPN per VRF per PE device. Multicast groups that create the data MDT group are dynamically chosen from a pool of configured IP addresses.

Question 6

Describe what’s happening in this configuration.

Device> enable
Device# configure terminal
Device(config)# ip multicast vrf cisco route-limit 200000 20000
Device(config)# ip multicast mrinfo-filter 4

Answer 6

• Configure Multicast Routes Limiting
• You configure multicast routes and information to limit the number of multicast routes that a device can add. An ACL can be used to filter the multicast device information request packets for all sources specified in the access list.

Question 7

What is true about implementing intranet multicast VPNs?

A. With an intranet MVPN, all the multicast clients are located in different organizations.
B. IP multicasting is an inefficient way to use network resources.
C. IP multicast routing enables a source to send packets to a group of receivers.
D. Multicast that uses a special form of IP address is called the IP unicast group address.

Answer 7

C