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Cisco Bug: CSCur74873 - XR traceroute "mpls ip-ttl-propagate disable" behaves unexpectedly

Last Modified

Jul 20, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.1.3.BASE 5.3.2.BASE

Description (partial)

The Traceroute Command in MPLS

Above document has described how traceroute with ?mpls ip-ttl-propagate disable? works in mpls environment. Customer reports as well as our lab test has proved that traceroute from IOS device has behaved as expected, but traceroute originted from IOS-XR device would demonstrate unexpected behavior. This need BU to determine whether it's a bug or provide convincible explanation.

1. labelled traceroute (traceroute in mpls environment) with ?mpls ip-ttl-propagate disable? 
2. traceroute originated from IOS-XR device, or IOS-XR is access device to customer equipment on which traceroute being generated

Related Community Discussions

ASR9K: "mpls ip-ttl-propagate disable" が有効とならない
2015年7月18日(初版) TAC SR Collection 主な問題 ASR9000 シリーズルータの Typhoon LC 上のインタフェースにおいて、&quot;mpls ip-ttl-propagate disable&quot; 設定時に、自発パケットの IP TTL が MPLS TTL に引き継がれてしまうことが報告されています。 本来であれば MPLS TTL は 255 に set されます。 例外として IP TTL  が 1 である、traceroute パケットは本問題の影響を受けず、設定によって、自発パケットの IP TTL が MPLS TTL に引き継がれません。 原因 この問題は <key>CSCur74873</key>として報告されています。 <key>CSCur74873</key>: XR traceroute &quot;mpls ip-ttl-propagate disable&quot; behaves unexpectedly 解決策 &quot;mpls ip-ttl-propagate disable local&quot; として、local option をご使用いただくことで、自発パケットに IP TTL が引き継がれることを無効にできますが、その場合、transit ...
Latest activity: Jul 24, 2015
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