[GROW] Comment on draft-ietf-grow-bmp-tlv
"Dhananjay Patki (dhpatki)" <dhpatki@cisco.com> Wed, 10 January 2024 11:06 UTC
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From: "Dhananjay Patki (dhpatki)" <dhpatki@cisco.com>
To: Paolo Lucente <paolo@ntt.net>, "guyunan@huawei.com" <guyunan@huawei.com>, "grow@ietf.org" <grow@ietf.org>
Thread-Topic: Comment on draft-ietf-grow-bmp-tlv
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Date: Wed, 10 Jan 2024 11:05:53 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/grow/RsJivjA6lZd0UYQjedaqgwTquNs>
Subject: [GROW] Comment on draft-ietf-grow-bmp-tlv
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Hi Paulo, Yunan,
I have a few comments on draft-ietf-grow-bmp-tlv.
1. It would help to introduce the format of Group TLV in Section 4.2.1; just like how the format of the indexed TLV is introduced in Section 3. Currently, group_index is learnt only from the example in section 4.2.1.1.
2. In a group TLV, ‘index’ and ‘group_index’ are 2 different fields. ‘index’ is redundant (always set to 0). Index=0 means that the TLV applies to all NLRIs which is not true in case of Group TLV.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| type=TBD2 | length=0x000a |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| index=0 | group_index=0x000c |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| value={0x0004, 0x0005, |
| 0x0006} |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
This could be avoided by using the index space itself for group_index, but differentiated using a bit called ‘G bit’. This bit, when set, would mean that the index is a group index.
Format:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (2 octets) | Length (2 octets) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|G| Index (15 bits) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ Value (variable) ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Example:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| type=TBD2 | length=0x000a |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1| index=0x000c |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| value={0x0004, 0x0005, |
| 0x0006} |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3. Section 4.2.1 says “One or more 2 bytes indexes ..”. Shouldn’t this be “Two or more 2 byte indexes ..”? If the TLV pertains to a single NLRI, Group TLV is not necessary.
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Regards,
Dhananjay
- Re: [GROW] Comment on draft-ietf-grow-bmp-tlv Paolo Lucente
- [GROW] Comment on draft-ietf-grow-bmp-tlv Dhananjay Patki (dhpatki)