Subject: [Lsr] draft-xie-lsr-isis-sr-vtn-mt-02

From: Huaimo Chen <[email-masked]>
Date: Mon, 19 Oct 2020 15:09:07 +0000

Hi Authors,

    I have the following comments/questions:

    In a network, can we use other methods to define VTNs while MTs are used as VTNs?

    If so, other methods may be used to define VTNs in addition to using MTs as VTNs in the same network. The draft says that MT-ID could be used as VTN-ID. In this case, a block of VTN-IDs must be allocated/reserved specially for using MT-IDs as VTN-IDs. It seems better to state something about this in the draft.

    An IS-IS MT has the attributes of a VTN, including the specific topology and resource. An IS-IS MT can be used as a VTN and MT-ID can be used as a VTN ID. Is it possible for an IS-IS MT to be used/shared by two or more VTNs? If so, it seems better to have some details about how the multiple VTNs use/share the resource in the same one MT.

    In section 5 "Scalability Considerations", the draft says that while multiple VTNs share the same topology attribute, the same topology is identified by multiple different MT-IDs. This seems giving a way to let two or more VTNs to use/share one MT if IS-IS MT allows multiple MT-IDs to be used for the same one MT. It seems better to move the related text from section 5 to some of the previous sections.

Best Regards,
Huaimo