Wireshark-dev: Re: [Wireshark-dev] Some Sub-Tlvs description in FEC Stack are nonuniform with R
From: Jaap Keuter <[email protected]>
Date: Wed, 11 May 2011 11:23:53 +0200

Hi,

You're welcome to file a bug report at bugs.wireshark.org, where you can add a patch as well if you like.

Thanks,
Jaap

On Wed, 11 May 2011 00:19:10 -0700, Liu, Pengfei (Jeff) wrote:

 

Hi ,

 

The Sub-Type in FEC Stack is defined in RFC4379 as follow:

      Sub-Type       Length            Value Field

      --------       ------            -----------

      …………

             9           10            "FEC 128" Pseudowire (deprecated)       -----current name

            10           14            "FEC 128" Pseudowire

            11          16+            "FEC 129" Pseudowire

      …………

 

 

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Remote PE Address                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                             PW ID                             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            PW Type            |          Must Be Zero         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

             FEC 128 Pseudowire (Deprecated)

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     Sender's PE Address                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Remote PE Address                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                             PW ID                             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            PW Type            |          Must Be Zero         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                FEC 128 Pseudowire

 

 

 

But in packet-mpls-echo.c:209, It is defined as:

………….

#define TLV_FEC_STACK_L2_CID_OLD   9       -----CID? old name?

#define TLV_FEC_STACK_L2_CID_NEW  10

………….

 

And the hf is defined like this:

                ………….

                /*packet-mpls-echo.c:1219*/

                { &hf_mpls_echo_tlv_fec_l2cid_sender,

                        { "Sender's PE Address", "mpls_echo.tlv.fec.l2cid_sender",

                        FT_IPv4, BASE_NONE, NULL, 0x0, "MPLS ECHO TLV FEC Stack L2CID Sender", HFILL}

                },

                { &hf_mpls_echo_tlv_fec_l2cid_remote,

                        { "Remote PE Address", "mpls_echo.tlv.fec.l2cid_remote",

                        FT_IPv4, BASE_NONE, NULL, 0x0, "MPLS ECHO TLV FEC Stack L2CID Remote", HFILL}

                },

                { &hf_mpls_echo_tlv_fec_l2cid_vcid,

                        { "VC ID", "mpls_echo.tlv.fec.l2cid_vcid",

                        FT_UINT32, BASE_DEC, NULL, 0x0, "MPLS ECHO TLV FEC Stack L2CID VCID", HFILL}

                },

                ………….

 

For example, the CID VCID should be ‘PW ID’ of FEC 128 rather than some old or invalid alias.

 

This may confuse the users.

 

Best Regards,

Jeff

 

 



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