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2
ICL shut – Assume ICL between C1 and D1 is shut and if D1 is secondary VLT one half of the inter DC link
goes down. After vm motion, if a packet reaches D2 with the destination MAC address of D1, it may be
dropped. This behaviour is applicable only in the LLDP configuration; in the static configuration, the
packet is forwarded.
3
Any L3 packet, when it gets an L3 hit and is routed because of this feature, has a TTL decrement as
expected.
4
You can disable the VLT Proxy Gateway for a particular VLAN using an "Exclude-VLAN" configuration.
The configuration has to be done in both the VLT domains [C and D in VLT domain 1 and C1 and D1 in
VLT domain 2].
Static Proxy Configuration Method
Dell(conf-vlt-domain)#proxy-gateway static
Dell(conf-vlt-domain-pxy-gw-static)#remote-mac-address 01:23:45:67:89:ab
exclude-vlan 10
Dynamic Proxy Configuration Method
Dell(conf-vlt-domain)#proxy-gateway lldp
Dell(conf-vlt-domain-pxy-gw-lldp peer-domain-link port-channel 1 exclude-
vlan 10
5
Packet duplication may happen with "Exclude-VLAN" configuration – Assume exclude-vlan (say VLAN
10) is configured 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. If C's MAC address is learned at C1, only (no then) the packet is
not have flooded (to D1) and only switched to C and thus packet duplication may be avoided.
6
With the existing hardware capabilities, you can only disable VLT Proxy Gateway only for 500 VLANs,
using exclude-VLAN configuration.
Configuring a Static VLT Proxy Gateway
You can configure 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.
To configure the static proxy gateway, perform the following:
1
Enable VLT on a switch, then configure a VLT domain and enter VLT-Domain Configuration mode.
CONFIGURATION mode
Dell(conf)#vlt domain domain-id
2
Configure the static proxy gateway.
VLT DOMAIN mode
Dell(conf-vlt-domain)#proxy-gateway static
3
You can configure the remote MAC address of a VLT peer for a static proxy gateway and exclude a VLAN
or a range of VLANs from proxy routing. This parameter is for a static proxy gateway configuration.
VLT DOMAIN PROXY GW STATIC mode
Dell(conf-vlt-domain-proxy-gw-static)#remote-mac-address mac-address exclude-
vlan vlan-range
VLT Proxy Gateway
1148
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Troubleshooting
