training man-e cisco_multicast.pdf
TRANSCRIPT
Project: Mở rộng mạng MAN-E Cisco 2015
IP Multicast Implementation
Nội dung
Module 1 : Multicast Introduction
Module 2: IGMP and Layer 2 Issue
Module 3: Multicast Routing Protocol
Module 4: PIM SM Auto RP Announcement
Module 5: PIM SM and PIM SSM Configuration
Module 6: Introduce IPTV Model for MAN-E
Module 1: Multicast Introduction
Implement Multicast
Why Multicast ?
Multicast & Unicast
Multicast Advantages
Multicast Disadvantages
Type of Multicast Application
IP Multicast Application
IP Multicast Basic Addressing
IP Multicast Basic Addressing (cont.)
Layer 2 Multicast Addressing
Module 2: IGMP and Layer 2 Issue
Implement Multicast
IP Multicast Protocol Suite
IGMPv2
Multicast routers use IGMP to maintain information for each router interface about which multicast group traffic they should forward and which hosts want to receive it
IGMPv2 – Joining a Group
IGMPv2 – Maintaining a Group
IGMPv2 – Leaving a Group
IGMPv3 – Joining a Group
IGMPv3 – Changing a Group
Determining IGMP version running
Layer 2 Multicast Frame Switching
Layer 2 Multicast Switching Solution
Layer 2 Multicast Switching Solution - CGMP
Layer 2 Multicast Switching Solution – IGMP Snooping
Module 3: Multicast Routing Protocol
Implement Multicast
Multicast Protocol Basic
Shortest-Path Tree
Shortest-Path Tree (cont.)
Shared Distribution Tree
Multicast Distribution Tree Identification
Multicast Forwarding
PIM-DM Flood and Prune
PIM-DM Flood and Prune (cont.)
PIM-DM Flood and Prune (cont..)
PIM Sparse Mode
PIM-SM Shared Tree Join
1. The leaf routers knows the IP
address of the RP for group G
and sends a (*,G) Join for this
group towards the RP
2. Building a branch of the Shared
Tree that extends from the RP
to the last-hop router directly
connected to the receiver
PIM-SM Source Registration
1. Source encapsulates
multicast data in Register
Message and unicasts to
RP
2. RP encapsulates the
multicast data packet
inside of the Register
message and forwards it
down the Shared Tree
3. The RP also sends an
(S,G) Join back to the
source network S to
create a branch of an
(S,G) Shortest Path Tree
PIM-SM Source Registration (cont.)
1. As soon as the SPT is
build from teh Source
router to the RP,
multicast traffic begins to
flow natively from the
souce S to the RP
2. Once the RP begins
receiving data natively (ie
down the SPT) from
source S, it sends a
Register Stop to the
source's first hop router
to inform it that it can
stop sending the unicast
Register messages
PIM-SM Source Registration (cont..)
At this point, multicast traffic from the source is flowing down the SPT
to the RP and from there, down the Shared Tree to the receiver
PIM-SM SPT Switchover
The default behavior for the PIM-
SM leaf routers attached to active
receivers is to immediate join the
SPT to the source as soon as the
first packet arrives via the (*,G)
Shared Tree.
Can change SPT-Threshold –
meaning multicast traffic rate
before switchover
PIM SSM
• Source-Specific Multicast (SSM), defined in RFC 4607, extends this concept to identify a set of multicast hosts not only by group address but also by source.
• IANA has reserved for SSM the IPv4 address range 232.0.0.0/8
• PIM SSM uses PIM SM work with IGMPv3 to build SPT only toward to Source.
• Advantages of PIM SSM
– SSM channel is defined by both a source and a group address, group addresses can be re-used by multiple sources while keeping channels unique.
– SSM does not rely on the designation of a rendezvous point (RP) to establish a multicast tree.
Module 4: PIM SM Auto RP Announcement
Implement Multicast
Auto RP Discovery Overview
Router can use one of the following three methods to learn the IP address of an RP:
The RP address can be statically configured on all the PIM-SM.
The Cisco-proprietary Auto-RP protocol can be used to designate the RP and advertise its IP address so that all PIM-SM routers can learn its IP address automatically.
A standard BootStrap Router (BSR) protocol can be used to designate the RP and advertise its IP address so that all the PIM-SM routers can learn its IP address automatically.
Auto-RP Protocol
Step 1:
The RP sends RP-Announce messages to the reserved multicast address 224.0.1.39 stating that the router is an RP.
The RP-Announce message also allows the router to advertise the multicast groups for which it is the RP, thereby allowing some load-balancing of the RP workload among different routers.
Step 2:
One router be configured as a mapping agent.
The mapping agent multicasts another message, called RP-Discovery 224.0.1.40 to informs the general router population as to which routers they should use as RPs.
Auto-RP Protocol
Simple Auto RP Configuration
BSR Protocol
1. The candidate-RPs send their
candidate-RP advertisements
directly to the elected BSR
2. The bootstrap message sent by
the BSR includes information about
all the candidate-RPs. BSR
message uses PIM Message hop-
by-hop on each router.
3. Each router uses a common
algorithm to select the same RP
address for a given multicast group
Simple BSR Configuration
On each router: ip multicast-routing
On each interface: ip pim sparse-mode
On Router A,C: ip pim rp-candidate loopback 0
On Router B: ip pim bsr-candidate loopback 0
Module 5: PIM SM & PIM SSM Configuration
Implement Multicast
PIM-SM Configuration Commands
PIM-SM Configuration Commands (cont.)
Auto-RP configuration
BSR configuration
PIM SSM Configuration Commands
Enable PIM SSM
Inspect Multicast Routing Table
Show ip mroute
Finding PIM Neighbor
Show ip pim interface
Show ip pim neighbor
Show ip pim rp
IOS & IOS XR
Enable Multicast Routing
Static RP
Auto-RP Configuration
IOS & IOS XR (cont.)
BSR Configuration Enable PIM SSM
Module 6: Introduce IPTV Model For MAN-E
Implement Multicast
IPTV & VoD Service Model VoD:
1. STB unicasts to EPG and VoD
Server
2. U-PE relays STB’s DHCP
message to DHCP server
3. User isolation at Metro
switches , DSLAM and
Bridge-domain split horison
IPTV:
1. IP Multicast from BTV server
to STB
2. Using PIM SSM for multicast
routing. U-PE & PE-AGG must
have routes to BTV server in
IP routing table.
3. U-PE must map IGMPv2 to
IGMPv3 in case of STB
doesn’t support IGMPv3
PIM SSM Mapping on U-PE
Example of configuring PIM SSM and SSM Mapping on U-PE
THANK YOU FOR LISTENING !
Project: Mở rộng mạng MAN-E Cisco 2015