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Re: [Bier] Comments on draft-ietf-bier-evpn-02

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Sat, 25 January 2020 19:06 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "EXT-zhang.zheng@zte.com.cn" <zhang.zheng@zte.com.cn>, Antoni Przygienda <prz@juniper.net>, "sajassi@cisco.com" <sajassi@cisco.com>, "jorge.rabadan@nokia.com" <jorge.rabadan@nokia.com>
CC: "bier-chairs@ietf.org" <bier-chairs@ietf.org>, "bier@ietf.org" <bier@ietf.org>
Thread-Topic: [Bier] Comments on draft-ietf-bier-evpn-02
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Date: Sat, 25 Jan 2020 19:06:44 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/ZG4ckRcE7ED43V_1l6QBwqxCJu8>
Subject: Re: [Bier] Comments on draft-ietf-bier-evpn-02
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Hi Sandy,

Sorry for the late response.
It’s not the PH router that gets a multicast address used to send traffic to the PE. The ingress PE must already use a multicast address known to all PEs.

Jeffrey

From: zhang.zheng@zte.com.cn <zhang.zheng@zte.com.cn>
Sent: Sunday, January 5, 2020 10:33 PM
To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>; Antoni Przygienda <prz@juniper.net>; sajassi@cisco.com; jorge.rabadan@nokia.com
Cc: bier-chairs@ietf.org; bier@ietf.org
Subject: [Bier] Comments on draft-ietf-bier-evpn-02


Hi authors,



Happy New Year!



I am reading the "draft-ietf-bier-evpn-02" draft. I have a question on section 2.1 in "draft-ietf-bier-evpn-02", there is the description: The tunnel endpoint MUST be an IP multicast address and the receiving egress PE MUST be set up to receive and process packets addressed to the address.



The IP multicast address can simplify the forwarding procedure on PHP routers. But I am wondering how the PHP routers will do when it's hard to get a consistent multicast address among the BFERs which can not support BIER forwarding.

And if unicast tunnel can be used here too?



Thanks,

Sandy

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