Default Gateway responds to ARP request for the default gateway, not to an ARP request for any host.
An EVPN PE should respond to an ARP request if it knows that the IP address being requested exists on a different ethernet segment than the one on which the ARP request arrived. -- Jakob Heitz. ________________________________ From: [email protected] [mailto:[email protected]] Sent: Thursday, December 27, 2012 5:39 PM To: Jakob Heitz; [email protected] Cc: [email protected]; [email protected] Subject: Re: Multi-subnet VNs - should be a new service type? Does Lucy refer to the scenario that, if host_A requests MAC of host_B which resides in the same switched network, the default gateway should not reply such ARP request, otherwise host_A will receive ARP reply both from host_B and default gateway. Lizhong > > Re: [nvo3] Multi-subnet VNs - should be a new service type? > > Certainly. But how it that an issue? > -- > Jakob Heitz. > > > From: [email protected] [mailto:[email protected]] On Behalf Of > Lucy yong > Sent: Thursday, December 27, 2012 3:20 PM > To: Jakob Heitz; Black, David > Cc: [email protected] > Subject: Re: [nvo3] Multi-subnet VNs - should be a new service type? > A host may get an arp request via the switched network and reply > with its MAC address if IP address matches. > This is current host be behavior. > Lucy > > From: Jakob Heitz [mailto:[email protected]] > Sent: Thursday, December 27, 2012 5:18 PM > To: Lucy yong; Black, David > Cc: [email protected] > Subject: RE: Multi-subnet VNs - should be a new service type? > > Multicast traffic is not at issue. > You said: > This will have an issue if VAP of EVPN are via a switched network > What is the issue? > -- > Jakob Heitz > > > > From: Lucy yong [mailto:[email protected]] > Sent: Thursday, December 27, 2012 3:04 PM > To: Jakob Heitz; Black, David > Cc: [email protected] > Subject: RE: Multi-subnet VNs - should be a new service type? > > > From: Jakob Heitz [mailto:[email protected]] > Sent: Thursday, December 27, 2012 3:25 PM > To: Lucy yong; Black, David > Cc: [email protected] > Subject: RE: Multi-subnet VNs - should be a new service type? > > What is the issue? > > Are you referring to the case where a network > is connected to multiple EVPN PEs in a multihoming > arrangement? > [Lucy] no, for multihoming case, there is designated forwarder to > forward multicast traffic. > > If that is the case, then I think the EVPN draft is > not clear. It should point out that an EVI acting as > standby in an active-standby topology can not act > as Default Gateway. > -- > Jakob Heitz. > > > > From: Lucy yong [mailto:[email protected]] > Sent: Thursday, December 27, 2012 11:06 AM > To: Jakob Heitz; Black, David > Cc: [email protected] > Subject: RE: Multi-subnet VNs - should be a new service type? > This will have an issue if VAP of EVPN are via a switched network. > Need to modify the ARP response schema. > > Lucy > > From: Jakob Heitz [mailto:[email protected]] > Sent: Thursday, December 27, 2012 12:58 PM > To: Lucy yong; Black, David > Cc: [email protected] > Subject: RE: Multi-subnet VNs - should be a new service type? > > The Default Gateway feature of EVPN helps to avoid tromboning. > http://tools.ietf.org/html/draft-ietf-l2vpn-evpn-02, Sec. 11.1. > Every PE responds to the ARP request for the default router > and every PE will route packets with the destination MAC of the > default router. > -- > Jakob Heitz. x25475. 510-566-2901 > >
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