November 2001
Intermediate to advanced
320 pages
7h 58m
English
Content preview from IP SANs: A Guide to iSCSI, iFCP, and FCIP Protocols for Storage Area NetworksBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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11.2. 802.1p Traffic Prioritization
As discussed in Chapter 3, link-layer IEEE 802.1p/Q VLAN tagging includes a 3-bit field for specifying traffic prioritization levels. The 3-bit field allows for 8 levels of prioritization (0 to 7), with 7 representing the highest priority. Not all IP router or Gigabit Ethernet switch products support all 8 levels of priority, but most will provide at least 4 assignable levels.
Class-of-service prioritization is fulfilled through buffer queues. With no class-of-service designations, packets would be forwarded on a first-in/first-out basis through one buffer. Prioritization requires creation of multiple buffer queues so that traffic can be sorted by priority tag. As shown in Figure 11-1, the queues themselves ...
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