Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 88

www.dell.com | support.dell.com Linktrace Message and Response Linktrace Message and Response (LTM, LTR), also called Layer 2 Traceroute, is an administratively sent multicast frames transmitted by MEPs to track, hop-by-hop, the path to another MEP or MIP within the maintenance domain. All MEPs and MIPs in the same domain respond to an LTM with a unicast LTR. Intermediate MIPs forward the LTM toward the target MEP. Figure 7-4. Linktrace Message and Response MPLS Core MEP MIP MIP MIP Linktrace mMessage Linktrace Response Link trace messages carry a unicast target address (the MAC address of an MIP or MEP) inside a multicast frame. The destination group address is based on the MD level of the transmitting MEP (01:80:C2:00:00:3[8 to F]). The MPs on the path to the target MAC address reply to the LTM with an LTR, and relays the LTM towards the target MAC until the target MAC is reached or TTL equals 0. Task Command Syntax Send a Linktrace message. Since the LTM is a Multicast message traceroute ethernet domain sent to the entire ME, there is no need to specify a destination. Command Mode EXEC Privilege Link Trace Cache After a Link Trace command is executed, the trace information can be cached so that you can view it later without retracing. Task Enable Link Trace caching. Set the amount of time a trace result is cached. Set the size of the Link Trace Cache. Command Syntax traceroute cache traceroute cache hold-time minutes Default: 100 minutes Range: 10-65535 minutes traceroute cache size entries Default: 100 Range: 1 - 4095 entries Command Mode CONFIGURATION ETHERNET CFM ETHERNET CFM 88 | 802.1ag