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Re: [dc] comments and suggestions to draft-narten-nv03-overlay-problem-statment-01

Linda Dunbar <linda.dunbar@huawei.com> Fri, 27 January 2012 16:49 UTC

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From: Linda Dunbar <linda.dunbar@huawei.com>
To: Paul Unbehagen <paul@unbehagen.net>
Thread-Topic: [dc] comments and suggestions to draft-narten-nv03-overlay-problem-statment-01
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Date: Fri, 27 Jan 2012 16:47:09 +0000
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Cc: Thomas Narten <narten@us.ibm.com>, "dc@ietf.org" <dc@ietf.org>, "david.black@emc.com" <david.black@emc.com>, Dinesh Dutt <ddutt@cisco.com>, Murari Sridharan <muraris@microsoft.com>, "kreeger@cisco.com" <kreeger@cisco.com>
Subject: Re: [dc] comments and suggestions to draft-narten-nv03-overlay-problem-statment-01
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Paul,

See my comments below:



The limitation for PBB and VLAN should include that MAC addresses can’t be aggregated, therefore forwarding table can be very large for large data centers.

Disagree, this isn't what we see in live deployments. Since the Mac learning of the host stations only happens at the edge switches and the services are distributed across many edge switches the ISID service Mac table sizes don't end up being that large on any given node. Additionally the core never sees any macs but the nodes participating in the backbone from edge switch to edge switch.

[Linda] If PBB’s MAC-in-MAC Overlay encapsulation is done at the access switches in data center, then the core switches forwarding table won’t explode. However, if the Mac-in-Mac overlay encapsulation is performed by servers’ hypervisor, the switches’ forwarding table could explode if there are hundreds of thousands of servers in data center, which is getting more and more common in large data centers.

Linda

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