ExtremeSwitching (EXOS)

  • 1.  icmp - TTL Exceeded mpls

    Posted 08-27-2015 06:18
    Hello, colleagues. Help to solve following problem :
    There is a diagram of switching on

    Customers ->MX240--ldp lsp-->X670--ldp lsp-->X670--ldp lsp-->ldp lsp-->X670--ldp lsp-->MX480-->Internet

    All Extreme X670 - 15.7.2.9 - intermediate LSR
    MX240 - egress mpls lsr
    MX480 - ingress mpls lsr

    Between MX240 and MX480 bgp session is set .
    Сustomer does traceroute :

    traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
    1 10.10.10.1 (10.10.10.1) 0.327 ms 0.332 ms 0.315 ms
    2 * * * here shall be first X670
    3 * * * here shall be second X670
    4 * * * here shall be third X670

    To documentation it is written :
    "In pipe TTL mode, the LSP is viewed as a point-to-point link between the ingress LSR and the egress LSR; intermediate LSRs in the MPLS network are not viewed as router hops from an IP TTL perspective. "

    Why from X670 doesn't come ttl exceeded ? Why X670 generally is visible in trace ?


  • 2.  RE: icmp - TTL Exceeded mpls

    Posted 08-27-2015 08:02
    Do you mean that the trace dosen't show the X670 ?


    // Andrease


  • 3.  RE: icmp - TTL Exceeded mpls

    Posted 08-27-2015 08:29
    Yes.
    I supposed that X670 generally won't be visible in the route



  • 4.  RE: icmp - TTL Exceeded mpls

    Posted 08-27-2015 10:47
    Yeah since juniper use two different styles of this I'm not sure that extreme even support this ? cause it has to happen at the LSP level.

    // Andeas



  • 5.  RE: icmp - TTL Exceeded mpls

    Posted 08-27-2015 11:28
    Analogs mpls icmp-tunneling , mpls no-decrement-ttl on X670 I didn't find .
    From hopelessness I tried iproute mpls-next-hop, ospf mpls-next-hop , but it of course didn't help.