Some nits:
1. title of Section 4.3.2: /FIB Entry is a Local Interface/FIB Entry Is A Local Interface
2. title of Section 5.2: /SR Domain as a single system with delegation among components/SR Domain as A Single System with Delegation among Components
3. Section 2.1.1: /There are two types of padding TLVs, pad1 and padN, the following applies to both/There are two types of Padding TLVs, pad1 and padN, the following applies to both
4. Section 2.1.2: "Alignment requirement: 8n". What is 8n? For better readability, can you give a more clear clarification text?
5. Section 4.1: /HMAC TLV may be set according to Section 7./HMAC TLV may be set according to Section 2.1.2./?
6. Section 4.3: have a "*" before every item of "A FIB entry..." ?

1 issue:
The Security Considerations Section mainly clarifies the security protection based on the strict SR Domain boundary protection paradigm, and the considerations of some identified attacks. They are valuable, but maybe not complete in scope. I noticed 2 SR related security consideration drafts (draft-perkins-sr-security-00 and draft-li-spring-srv6-security-consideration-00), which are trying to summarize all the possible vulnerabilities in SR network. I personally suggests the authors to review them and consider how to reference or incorporate the valuable considerations from them.