Trigger a Layer 2 Traceroute
Note
This procedure does not apply to XA1400 Series.
Use this procedure to trigger a Layer 2 traceroute, which acts like native traceroute. This feature enables CFM to debug Layer 2 in an SPBM cloud or network. It can determine the path used by IS—IS to get from one MEP to another, by showing all the hops between. Therefore, it can show where connectivity is lost. It can also work for IP shortcuts.
Important
-
For B-VLANs, you do not have to trigger an l2ping to learn the MAC address because IS-IS populates the MAC addresses in the FDB table.
linktrace traces the path up to the closest device to that MAC address that supports CFM.
Before you begin
-
You must have a MEP that is associated with a VLAN.
Procedure
l2 traceroute {<vlan <1-4059> routernodename WORD<0–255> | <vlan <1-4059> mac <0x00:0x00:0x00:0x00:0x00:0x00>} [priority <0–7>] [source-mode <nodal|noVlanMac|smltVirtual>] [ttl <1–255>]
l2 traceroute {ip-address WORD<0–255>} [priority <0–7>][source-mode <nodal|noVlanMac|smltVirtual>][ttl <1–255>] [vrf WORD<1–16]
Examples
Switch:1# l2 traceroute vlan 2 routernodename Switch-MONTIO
Please wait for l2traceroute to complete or press any key to abort l2traceroute to Switch-MONTI0 (00:14:0d:a2:b3:df), vlan 2 0 Switch-PETER4 (00:15:9b:11:33:df) 1 Switch-MONTI0 (00:14:0d:a2:b3:df)
Switch:1# l2 traceroute ip-address 192.0.2.10
Please wait for l2trace to complete or press any key to abort L2 Trace Statistics : IP 192.0.2.10, paths found 1 ================================================================== Switch-SHAMIM (00:1a:8f:08:53:df), vlan 2 0 Switch-PETER4 (00:15:9b:11:33:df) 1 Switch-MONTI0 (00:14:0d:a2:b3:df)
Variable Definitions
The following table defines parameters for the l2 traceroute command.
Variable |
Value |
---|---|
{vlan <1-4059> routernodename WORD<0–255> } (vlan <1-4059> mac <0x00:0x00:0x00:0x00:0x00:0x00> } {ip-address WORD<0–255> } |
Specifies the destination for the L2 traceroute:
|
ttl-value <1–255> |
Specifies the TTL value. The default is 64. |
priority <0–7> |
Specifies the priority. The default is 7. |
source-mode<nodal|noVlanMac|smltVirtual> |
Specifies the source mode:
The default is 1: nodal. |
vrf WORD<1–16 |
Specifies the VRF name. |