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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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VLT Unicast Routing

VLT unicast routing is a type of VLT peer routing that locally routes unicast packets destined for the L3 endpoint of the VLT peer. This method avoids sub-optimal routing. Peer-routing syncs the MAC addresses of both VLT peers and requires two local DA entries in TCAM. If a VLT node is down, a timer that allows you to configure the amount of time needed for peer recovery provides resiliency. You can enable VLT unicast across multiple configurations using VLT links. You can enable ECMP on VLT nodes using VLT unicast.

VLT unicast routing is supported on both IPv4 and IPv6. To enable VLT unicast routing, both VLT peers must be in L3 mode. Static route and routing protocols such as RIP, OSPF, ISIS, and BGP are supported. However, point-to-point configuration is not supported. To enable VLT unicast, the VLAN configuration must be symmetrical on both peers. You cannot configure the same VLAN as Layer 2 on one node and as Layer 3 on the other node. Configuration mismatches are logged in the syslog and display in the show vlt mismatch command output.

If you enable VLT unicast routing, the following actions occur:
  • L3 routing is enabled on any new IP address / IPv6 address configured for a VLAN interface that is up.
  • L3 routing is enabled on any VLAN with an admin state of up.
NOTE If the CAM is full, do not enable peer-routing.
NOTE The peer routing and peer-routing-timeout is applicable for both IPv6/ IPv4.

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