EasyManuals Logo

Cisco Catalyst 3750-X User Manual

Cisco Catalyst 3750-X
1438 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #1220 background imageLoading...
Page #1220 background image
48-36
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 48 Configuring IP Multicast Routing
Configuring Advanced PIM Features
Figure 48-6 Shared Tree and Source Tree (Shortest-Path Tree)
If the data rate warrants, leaf routers (routers without any downstream connections) on the shared tree
can use the data distribution tree rooted at the source. This type of distribution tree is called a
shortest-path tree or source tree. By default, the software switches to a source tree upon receiving the
first data packet from a source.
This process describes the move from a shared tree to a source tree:
1. A receiver joins a group; leaf Router C sends a join message toward the RP.
2. The RP puts a link to Router C in its outgoing interface list.
3. A source sends data; Router A encapsulates the data in a register message and sends it to the RP.
4. The RP forwards the data down the shared tree to Router C and sends a join message toward the
source. At this point, data might arrive twice at Router C, once encapsulated and once natively.
5. When data arrives natively (unencapsulated) at the RP, it sends a register-stop message to Router A.
6. By default, reception of the first data packet prompts Router C to send a join message toward the
source.
7. When Router C receives data on (S,G), it sends a prune message for the source up the shared tree.
8. The RP deletes the link to Router C from the outgoing interface of (S,G). The RP triggers a prune
message toward the source.
Join and prune messages are sent for sources and RPs. They are sent hop-by-hop and are processed by
each
PIM device along the path to the source or RP. Register and register-stop messages are not sent
hop-by-hop. They are sent by the designated router that is directly connected to a source and are received
by the RP for the group.
Multiple sources sending to groups use the shared tree
.
You can configure the PIM device to stay on the s
hared tree. For more information, see the “Delaying
the Use of PIM Shortest-Path T
ree” section on page 48-37.
Router A
Source
Receiver
Router C
RP
Router B
Shared tree
from RP
Source tree
(shortest
path tree)
44967

Table of Contents

Other manuals for Cisco Catalyst 3750-X

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Cisco Catalyst 3750-X and is the answer not in the manual?

Cisco Catalyst 3750-X Specifications

General IconGeneral
Switching Capacity160 Gbps
Stacking Bandwidth64 Gbps
Max Stacking Units9
Layer SupportLayer 2 and Layer 3
Form FactorRack-mountable
DRAM256 MB
Flash Memory64 MB
ModelCisco Catalyst 3750-X Series
Ports24 or 48 10/100/1000 Ethernet ports
Uplink Interfaces4 SFP or 2 SFP+
FeaturesStackWise Plus, EnergyWise
ImageIP Base or IP Services
Operating Temperature0 to 40°C
Operating Humidity10 to 85% noncondensing

Related product manuals