Proposed Mechanisms for Congestion Control/Failure Recovery in OSPF & ISIS Networks
draft-ash-ospf-isis-congestion-control-02
| Document | Type |
Expired Internet-Draft
(individual)
Expired & archived
|
|
|---|---|---|---|
| Author | Gerald Ash | ||
| Last updated | 2002-06-18 | ||
| RFC stream | (None) | ||
| Intended RFC status | (None) | ||
| Formats | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | Expired | |
| Telechat date | (None) | ||
| Responsible AD | (None) | ||
| Send notices to | (None) |
This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:
Abstract
Earlier papers and contributions identified issues of congestion control and failure recovery for link-state protocol networks, such as OSPF, ISIS, and PNNI networks [maunder, choudhury, pappalardo1, pappalardo2, atm01-0101]. The problem addressed is to enable link-state protocols to a) gracefully recover from massive loss of topology database information, and b) respond gracefully to network overloads and failures. This contribution proposes specific additional considerations for network congestion control/failure recovery. Candidate mechanisms are proposed for control of network congestion and failure recovery, in particular we initially propose to investigate the following mechanisms: a) throttle new connection setups, topology-state updates, and Hello updates based on automatic congestion control mechanisms, b) special marking of critical control messages (e.g., Hello and topology-state-update Ack) so that they may receive prioritized processing, c) database backup, in which a topology database could be automatically recovered from loss based on local backup mechanisms, and d) hitless restart, which allows routes to continue to be used if there is an uninterrupted data path, even if the control path is interrupted due to a failure. We propose that the OSPF and ISIS working groups include the candidate mechanisms in an evaluation of congestion control/failure recovery for OSPF and ISIS networks.
Authors
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