Trigger a Layer 2 Tracemroute
Use this procedure to debug the IP Multicast over Fabric Connect stream path using l2 tracemroute on the VLAN (Layer 2) or the VRF (Layer 3). This procedure queries the SPBM multicast module to determine the B-VLAN, I-SID and nickname for the S and G streams. The nickname and I-SID are used to create a multicast MAC address.
Note
The VLAN option is only valid for a VLAN that has an I-SID configured and IGMP snooping enabled.
Before you begin
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On the source and destination nodes, you must configure an autogenerated or an explicit CFM MD, MA, and MEP.
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Enable the MEP.
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Assign a nodal MEP to the B-VLAN.
Procedure
Examples
The following is a sample output for a Layer 2 tracemroute on a VLAN:
Switch:1>enable Switch:1#configure terminal Switch:1(config)#l2 tracemroute source 192.0.2.81 233.252.0.1 vlan 201 Please wait for l2 tracemroute to complete or press any key to abort. Source 192.0.2.81 Group: 233.252.0.1 VLAN:201 BMAC: 03:00:03:f4:24:01 B-VLAN: 10 I-SID: 16000001 =============================================================== 1 PETER4 00:03:00:00:00:00 -> LEE1 00:14:0d:bf:a3:df 2 LEE1 00:14:0d:bf:a3:df -> LEE2 00:15:e8:b8:a3:df
The following is a sample output for a Layer 2 tracemroute on a VRF:
Switch:1>enable Switch:1#configure terminal Switch:1(config)#l2 tracemroute source 192.0.2.10 group 233.252.0.1 vrf red Please wait for l2 tracemroute to complete or press any key to abort. Source 192.0.2.10 Group: 233.252.0.1 VRF: redID 1 BMAC: 03:00:04:f4:24:01 B-VLAN: 20 I-SID: 16000001 =============================================================== 1 PETER4 00:03:00:00:00:00 -> LEE1 00:14:0d:bf:a3:df 2 LEE1 00:14:0d:bf:a3:df -> LEE2 00:15:e8:b8:a3:df
Variable Definitions
The following table defines parameters for the l2 tracemroute command.
Variable |
Value |
---|---|
source <A.B.C.D> |
Specifies the source IP address. |
group <A.B.C.D> |
Specifies the IP address of the multicast group. |
vlan <1–4084> |
Specifies the VLAN value. |
vrf WORD<1–16> |
Specifies the VRF name. If you do not specify a VRF name, then the results are shown for the flow in the Global Router (default) context. |
priority <0–7> |
Specifies the priority value. |
ttl <1–255> |
Specifies the time-to-live (TTL) for the trace packet, which is how many hops the trace packet takes before it is dropped. |