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Re: [bess] comment on draft-ietf-bess-ir

Eric C Rosen <erosen@juniper.net> Wed, 02 September 2015 14:55 UTC

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To: Lucy yong <lucy.yong@huawei.com>, "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>, "draft-ietf-bess-ir@tools.ietf.org" <draft-ietf-bess-ir@tools.ietf.org>
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From: Eric C Rosen <erosen@juniper.net>
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Cc: "bess@ietf.org" <bess@ietf.org>
Subject: Re: [bess] comment on draft-ietf-bess-ir
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On 9/2/2015 9:47 AM, Lucy yong wrote:
> Let me clarify, I suggest to relax the second rule in Section 6.2, i.e.
> no need to require N to have exact same set of downstream neighbors in
> two tunnels. For example, if K1 has downstream neighbors n1~n10 and K2
> has downstream neighbors n2-n10. N node can assign a single label for
> the upstream for both tunnels. As a result, the packet with this label
> from upstream node will be sent to downstream neighbors n1-n10; n1
> accepts the packets that associate with K1 and discard the packets that
> associate with K2. N2-N10 will accept the packets that associate with
> either K1 or K2.

Lucy,

The ingress replication procedures are designed so that the forwarding 
is entirely MPLS-based, and the intermediate nodes are not required to 
examine the payload or to maintain any VPN-specific flow states.

In the scenario you describe above, the K1 packets from N and the K2 
packets from N will arrive at N1 with the same top label.  Hence N1 will 
forward the K1 packets just as if they were K2 packets, causing an 
unintended merging of the two tunnels.

Eric

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