Multicast Tool3/21/2021
SW-3(config-if)shut Result: on the multicast routing-table of SW4 we receive now the multicast traffic from SW-2 (Gi102), no problem here: SW-4 show ip mroute.These examples are based on the labs I used to practice the CCIE RS practical exam.
Content of the posts Any-source multicast (ASM) with static RP Any-source multicast (ASM) with auto-RP Any-source multicast (ASM) with anycast RP Any-source multicast (ASM) with bootstrap router (aka PIMv2) Source-specific multicast (SSM) Including, for each topic: A network drawing The configuration details. Source-Specific multicast (SSM) Lab design and description The network design is the same for every scenario: I use four layer-3 Cisco 3650 catalyst switches running IOS-XE. With layer-3 ptp interfaces between them to create a small layer-3 network. OSPF is running between the switches to advertise all the networks: the ptp networks, the loopback0 interfaces and the VLAN10 of SW-1, where is the multicast source. For the multicast source, I use a laptop running two VLC instances, sending video stream traffic to 233.1.2.3 and 234.1.2.3, both on port 30001. The receiver will be simulated by the loopback0 interface of SW-4. Click on the image to see a larger version) On this scenario, we will use PIM SSM. But, SSM instead is utilized to identify a specific source a receiver wishes to receive traffic from. We still use PIM sparse-mode but RP are no longer required since receivers subscribe directly to a source. IGMP Version 3 supports source filtering, which is required for SSM. Configuration First, we need to configure PIM on the interfaces between the four switches, on the interface where is source is located (VLAN10 of SW-1), the interface of the clients or receivers (in this case, the loopback0 of SW-4) and the loopback0 of SW-2. Do not forget to also configure ip multicast-routing, like below: SW-1,2,3,4. SW-X(config-if)ip pim sparse-mode Then, we configure PIM-SSM. Here, I specify the group 234.1.2.3 with the access-list 12: SW-2config t. Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected. T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet. X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement. Outgoing interface flags: H - Hardware switched, A - Assert winner. Use show ip mfib count to get better response time for a large number of mroutes. Forwarding Counts: Pkt CountPkts per secondAvg Pkt SizeKilobits per second. Other counts: TotalRPF failedOther drops(OIF-null, rate-limit etc). Source: 10.10.10.1032, Forwarding: 90671686390, Other: 90600 Failover test Path failover Now, lets see what happens if we cut the link between SW-3 and SW-4. Shutdown of the link between SW3 and SW4: SW-3(config)int gi104.
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