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--- cisco:multicasting [2012/10/14 04:39]
188.143.232.12 DGjrMLBF
+++ cisco:multicasting [2012/10/15 11:55] (current)
zagi old revision restored
@@ Line 1: / Line 1: @@
-Now we know who the snseilbe one is here. Great post!
+====== Multicasting ======
+===== PIM Modes =====
+In actuality, PIM refers to a family of very similar routing protocols, but which each operate in a different mode. These are:
+  * **PIM Dense Mode (PIM-DM) (RFC 3973)**
+  * **PIM Sparse Mode (PIM-SM) (RFC 4601)**
+  * **Bidirectional PIM (BIDIR-PIM) (RFC 5015)**
+<code>
+Router# show ip mroute
+IP Multicast Routing Table
+Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
+   L - Local, P - Pruned, R - RP-bit set, F - Register flag,
+   T - SPT-bit set, J - Join SPT, M - MSDP created entry,
+   X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
+   U - URD, I - Received Source Specific Host Report,
+   Z - Multicast Tunnel, z - MDT-data group sender,
+   Y - Joined MDT-data group, y - Sending to MDT-data group
+Outgoing interface flags: H - Hardware switched, A - Assert winner
+ Timers: Uptime/Expires
+ Interface state: Interface, Next-Hop or VCD, State/Mode
+(*, 224.0.1.40), 00:07:04/00:02:49, RP 2.2.2.2, flags: SJPL
+  Incoming interface: FastEthernet0/0, RPF nbr 10.0.12.2
+  Outgoing interface list: Null
+</code>
+The first two steps are accomplished with single commands in global configuration on all routers in the multicast domain:
+   R1(config)# ip multicast-routing
+   R1(config)# ip pim rp-address 172.16.34.1
+Note that there exist other means of configuring RP routers, namely Cisco's proprietary Auto-RP and PIMv2's Bootstrap Router (BSR) methods. In our example, only manual configuration is used.
+PIM is enabled per interface:
+   R1(config)# interface f0/0
+   R1(config-if)# ip pim sparse-mode
+Believe it or not, this is all the configuration necessary to get a bare bones multicast network up and running. After enabling PIM, routers will form adjacencies with other PIM routers and multicast routes will be exchanged:
+<code>
+R1# show ip pim neighbor
+PIM Neighbor Table
+Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
+  S - State Refresh Capable
+Neighbor          Interface                Uptime/Expires    Ver   DR
+Address                                                            Prio/Mode
+.0.12.2         FastEthernet0/0          00:06:39/00:01:30 v2    1 / DR S
+.0.14.4         FastEthernet0/1          00:06:40/00:01:30 v2    1 / DR S
+</code>