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Cisco Bug: CSCub17788 - LSP trace shows DS match mismatch

Last Modified

Dec 07, 2019

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases


Description (partial)

In case of LDP over single hop TE tunnel, the router may send wrong echo reply message for MPLS LDP traceroute, which contains wrong information in DSMAP tlv, such as downstream ip address and downstream interface address are swapped.

If the following conditions are matched, the issue is happen.
 1) LDP prefix is going over a single hop TE tunnel
 2) TE tunnel is unnumbered interface.
 3) traceroute is executed to LSP which contains TE tunnel path.
 4) P router (LSR) is affected IOS-XR and it is head of TE tunnel.
 (This issue only happens the affected router is in mid P router)
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