I need to know whether OSPF LSA updates have a default DSCP or TOS bit (or any other QOS marking) predefined on them, and whether default QOS policy-maps and class-maps define prioritization for routing protocol updates or whether they need be marked and QOS defined.
If manual marking of routing protocols is required, what DSCP should be defined for IPSEC VPN tunnel traffic?
Routing protocols are generally marked with an IP precedence value of 6 (Network Control). It is a good idea to reserve some bandwidth so that these packets are not dropped in case of congestions.
Hope this helps,