Re: [Ipoverib] draft-ietf-ipoib-link-multicast-03.txt
"H.K. Jerry Chu" <Jerry.Chu@eng.sun.com> Thu, 03 April 2003 05:11 UTC
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Date: Wed, 02 Apr 2003 21:11:08 -0800
From: "H.K. Jerry Chu" <Jerry.Chu@eng.sun.com>
Reply-To: "H.K. Jerry Chu" <Jerry.Chu@eng.sun.com>
Subject: Re: [Ipoverib] draft-ietf-ipoib-link-multicast-03.txt
To: Kanoj.Sarcar@Sun.COM
Cc: ipoverib@ietf.org
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Kanoj, ... <snip> >Of course, if the typical case is that join/attach will not fail >(ie the number of mcg's are not too great), we can probably punt >on this, but at least with a note that a limit on the number of >IP multicast groups exists depending on member hca's and fabric >(switch/SM) capability. How about adding the following note to the draft regarding this vunerability? 11.0 New Vunerability in IB Multicast Many IB multicast functions are subject to new types of failure due to resource constrains compared to Ethernet multicast. This includes the creation of an IB multicast group, the join call, both the "SendOnlyNonMember", the "FullMember", and the "NonMember" joins, and the attaching of a QP to a multicast group. In general, these failure conditions are implementation dependent, and are believed to be rare. Usually a failure can be propagated back to a foreground operation to cause the operation to fail. But some IB multicast functions are not tied to any foreground operation, making their failures difficult to notice. E.g., if an IP multicast router attempts to "NonMember" join a newly created multicast group in the local subnet, but the join call fails, packet forwarding for that particular multicast group will likely to fail silently without the notice of local multicast senders. This type of problems add more vulnerability to the already unreliable IP multicast operations. Implementations should log error messages upon any IB multicast failure. Network administrators should be aware of this vulnerability, and preserve enough multicast resources if IP multicast will be used heavily, or a certain degree of reliability is expected. Thanks, Jerry > >Thanks. > >Kanoj _______________________________________________ IPoverIB mailing list IPoverIB@ietf.org https://www1.ietf.org/mailman/listinfo/ipoverib
- [Ipoverib] draft-ietf-ipoib-link-multicast-03.txt H.K. Jerry Chu
- Re: [Ipoverib] draft-ietf-ipoib-link-multicast-03… Kanoj Sarcar
- Re: [Ipoverib] draft-ietf-ipoib-link-multicast-03… H.K. Jerry Chu
- Re: [Ipoverib] draft-ietf-ipoib-link-multicast-03… Kanoj Sarcar
- Re: [Ipoverib] draft-ietf-ipoib-link-multicast-03… H.K. Jerry Chu
- Re: [Ipoverib] draft-ietf-ipoib-link-multicast-03… Kanoj Sarcar