Administrator Guide

• Any L3 packet, when it gets an L3 hit and is routed, it has a time to live (TTL) decrement as expected.
• You can disable the VLT Proxy Gateway for a particular VLAN using an "Exclude-VLAN" conguration. The conguration has to be done
in both the VLT domains [C and D in VLT domain 1 and C1 and D1 in VLT domain 2].
Sample Conguration LLDP Method
Dell(conf-vlt-domain)#proxy-gateway ll
Dell(conf-vlt-domain-pxy-gw-lldp)#peer-domain-link port-channel 1 exclude-vlan 10
Sample Conguration Static Method
Dell(conf-vlt-domain)#proxy-gateway static
Dell(conf-vlt-domain-pxy-gw-static)#remote-mac-address <xx:xx:xx:xx:xx:xx> exclude-vlan 10
• Packet duplication may happen with “Exclude-VLAN” conguration – Assume you used the exclude-vlan option (called VLAN 10)
in C and D and in C1 and D1; If packets for VLAN 10 with C’s MAC address (C is in VLT domain 1) gets an L3 hit at C1 in VLT domain 2,
they are switched to both D1 (via ICL) and C via inter DC link. This may lead to packet duplication. Therefore, if C’s MAC address is
learned at C1, the packet does not ood to D1 and only switches to C and avoids packet duplication.
• With the existing hardware capabilities, you can only disable VLT Proxy Gateway only for 500 VLANs, using exclude-VLAN
conguration.
Conguring a Static VLT Proxy Gateway
You can congure a proxy gateway in VLT domains. A proxy gateway allows you to locally route the packets that are destined to an L3
endpoint of the other VLT domain.
Apply the following congurations in the Core L3 Routers C and D in local VLT domain and C1 and D1 in the remote VLT domain:
1 Congure proxy-gateway static in VLT Domain Conguration mode.
2 Congure remote-mac-address <mac-address> in VLT Domain Proxy Gateway LLDP mode. Congure the system mac-
addresses of both C and D in C1 and also in D1 in the remote VLT domain and vice versa.
Sample Static Conguration on C switch or C1 switch
Switch_C#conf
Switch_C(conf)#vlt domain 1
Switch_C(conf-vlt-domain1)#proxy-gateway static
Switch_C(conf-vlt-domain1-pxy-gw-static)#remote-mac-address <xx:xx:xx:xx:xx:xx>....
Conguring an LLDP VLT Proxy Gateway
You can congure a proxy gateway in a VLT domain to locally route packets destined to a L3 endpoint in another VLT domain.
Apply the following congurations in the Core L3 Routers C and D in the local VLT domain and C1 and D1 in the remote VLT domain:
1 Congure proxy-gateway lldp in VLT Domain Conguration mode.
2 Congure peer-domain-link port-channel <vlt portchannel ID> in VLT Domain Proxy Gateway LLDP mode. The
VLT port channel is the one that connects the remote VLT domain.
Sample Dynamic Proxy Conguration on C switch or C1 switch
Switch_C#conf
Switch_C(conf)#vlt domain 1
Switch_C(conf-vlt-domain1)#proxy-gateway lldp
Switch_C(conf-vlt-domain1-pxy-gw-lldp)#peer-domain-link port-channel 1....
VLT Proxy Gateway Sample Topology
VLT proxy gateway enables one VLT domain to act as proxy gateway for another VLT domain when a host or virtual machine is moved from
one VLT domain to the other VLT domain.
The following image depicts a sample topology in which VLT proxy gateway is congured.
VLT Proxy Gateway
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