Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 1110
Configuring VLAN-Stack over VLT, You can con VLT nodes, which function as RP
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synchronized from the VLT peer, after the RP starts receiving multicast traffic via these routes, these (S, G) routes are considered valid and are downloaded to the device. Only (S, G) routes are used to forward the multicast traffic from the source to the receiver. You can configure VLT nodes, which function as RP, as Multicast Source Discovery Protocol (MSDP) peers in different domains. However, you cannot configure the VLT peers as MSDP peers in the same VLT domain. In such instances, the VLT peer does not support the RP functionality. If the same source or RP can be accessed over both a VLT and a non-VLT VLAN, configure better metrics for the VLT VLANs. Otherwise, it is possible that one VLT node chooses a non-VLT VLAN (if the path through the VLT VLAN was not available when the route was learned) and another VLT node selects a VLT VLAN. Such a scenario can cause duplication of packets. ECMP is not supported when you configure VLT nodes as RPs. Backup RP is not supported if the VLT peer that functions as the RP is statically configured. With static RP configuration, if the RP reboots, it can handle new clients only after it comes back online. Until the RP returns to the active state, the VLT peer forwards the packets for the already logged-in clients. To enable the VLT peer node to retain the synchronized multicast routes or synchronized multicast outgoing interface (OIF) maps after a peer node failure, use the timeout value that you configured through the multicast peer-routing timeout value command. You can configure an optimal time for a VLT node to retain synced multicast routes or synced multicast outgoing interface (OIF), after a VLT peer node failure, through the multicast peer-routing-timeout command in VLT DOMAIN mode. Using the bootstrap router (BSR) mechanism, both the VLT nodes in a VLT domain can be configured as the candidate RP for the same group range. When an RP fails, the VLT peer automatically takes over the role of the RP. This phenomenon enables resiliency to be achieved by the PIM BSR protocol. Configuring VLAN-Stack over VLT To configure VLAN-stack over VLT, follow these steps. 1. Configure the VLT LAG as VLAN-stack access or trunk mode on both the peers. INTERFACE PORT-CHANNEL mode vlan-stack {access | trunk} 2. Configure VLAN as VLAN-stack compatible on both the peers. INTERFACE VLAN mode vlan-stack compatible 3. Add the VLT LAG as a member to the VLAN-stack on both the peers. INTERFACE VLAN mode member port-channel port-channel ID 4. Verify the VLAN-stack configurations. EXEC Privilege show running-config Sample configuration of VLAN-stack over VLT (Peer 1) 1110 Virtual Link Trunking (VLT)
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