04-10-2007 12:43 PM - edited 03-03-2019 04:29 PM
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?
Thanks,
-Scott
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04-10-2007 12:50 PM
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,
04-10-2007 12:50 PM
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,
04-10-2007 02:08 PM
Thanks that helps quite a bit! I'll check the document out, but off the cuff, how much bandwidth should be allocated for ospf hellos, and should bandwidth be allocated for the database propagation updates (which vary and use large mtu's).
Thanks,
-Scott
04-10-2007 02:13 PM
Just want to add to Harold's post that, by default, you can only allocate only 75% of the available bandwidth on an interface. The other 25% is reserved for all management traffic including routing protocol traffic. If you want to allocate more than 75% you need to use the interface command 'max-reserved-bandwidth (%)'.
HTH
Sundar
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