Troubleshooting Guide

Layer 2 tracemroute
The l2tracemroute command is a proprietary command that allows the user to trace the
multicast tree for a certain multicast flow. The user specifies source, group, and service context
(either VLAN or VRF) for the multicast flow to trace.
CFM sends a multicast LTM using an internal calculation to map the source, group, and context to
the corresponding target address. The LTR comes from all leaves of the multicast tree for that flow,
as well as transit nodes. The target MAC used in the LTM is a combination of the data I-SID and the
nickname and the packet is sent on the appropriate SPBM B-VLAN. The user can see the
generated multicast tree for that flow, which includes the data I-SID and nickname.
Nodal MPs
Nodal MPs provide both MEP and MIP functionality for SPBM deployments. Nodal MPs are
associated with a B-VLAN and are VLAN encapsulated packets. The Nodal MEP provides
traceability and troubleshooting at the system level for a given B-VLAN. Each node (chassis) has a
given MAC address and communicates with other nodes. The SPBM instance MAC address is used
as the MAC address of the Nodal MP. The Nodal B-VLAN MPs supports eight levels of CFM and
you configure the Nodal B-VLAN MPs on a per B-VLAN basis. Virtual SMLT 10 MAC addresses are
also able to respond for LTM and LBM.
Nodal B-VLAN MEPs
The Nodal B-VLAN MEPs created on the CP and function as if they are connected to the virtual
interface of the given B-VLAN. Because of this they are supported for both port and MLT based B-
VLANs. To support this behavior a MAC Entry is added to the FDB and a new CFM data-path table
containing the B-VLAN and MP level are added to direct CFM frames to the CP as required.
Nodal B-VLAN MIPs
The Nodal MIP is associated with a B-VLAN. VLAN and level are sufficient to specify the Nodal MIP
entity. The Nodal MIP MAC address is the SPBM system ID for the node on which it resides. If the
fastpath sends a message to the CP, the MIP responds if it is not the target and the MEP responds
if it is the target.
Nodal B-VLAN MIPs with SMLT
When Nodal MEPs or MIPs are on SPBM B-VLANs the LTM code uses a unicast MAC DA. The
LTM DA is the same as the target MAC address, which is the SPBM MAC address or the SMLT
MAC address of the target node.
Avaya Virtual Services Platform 8000 Series supports SMLT interaction with SPBM. This is
accomplished by using two B-VIDs into the core from each pair of SMLT terminating nodes. Both
nodes advertise the Nodal B-MAC into the core on both B-VIDS. In addition each node advertises
the SMLT virtual B-MAC on one of the two B-VLANs.
Operations and Management
January 2017 Troubleshooting 152
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