Dell MX9116n EMC SmartFabric OS10 User Guide - Page 522

Disable announcements of ASN values Modify the AS_PATH attribute of the received routes. • Disable prepending the local AS number in CONFIG-ROUTER-NEIGHBOR mode. local-as as-number no-prepend • Disable prepending the globally-configured AS number in CONFIG-ROUTER-NEIGHBOR mode. local-as as-number no-prepend replace-as Configure Dual Stack OS10 supports dual stack for BGPv4 and BGPv6. Dual stack BGP allows simultaneous exchange of the same IPv4 or IPv6 prefixes through different IPv4 and IPv6 peers. You can enable dual stack using the activate command in the corresponding address-family mode. By default, activate command is enabled for the IPv4 address family for all the neighbors. If a BGP-v4 neighbor wants to carry ipv6 prefix information, it activates the IPv6 address-family. For a BGP-v6 neighbor to carry ipv4 prefix, it activates the IPv4 address-family. 1. Enable support for the IPv6 unicast family in CONFIG-ROUTER-BGP mode. address family ipv6 unicast 2. Enable IPv6 unicast support on a BGP neighbor/template in CONFIG-ROUTER-BGP-AF mode. activate Configure administrative distance Routers use administrative distance to determine the best path between two or more routes to reach the same destination. Administrative distance indicates the reliability of the route; the lower the administrative distance, the more reliable the route. If the routing table manager (RTM) receives route updates from one or more routing protocols for a single destination, it chooses the best route based on the administrative distance. You can assign an administrative distance for the following BGP routes using the distance bgp command: • External BGP (eBGP) routes • Internal BGP (iBGP) routes • Local routes If you do not configure the administrative distance for BGP routes, the following default values are used: • eBGP-20 • iBGP-200 • local routes-200 To change the administrative distance for BGP, use the following command: distance bgp external-distance internal-distance local-distance Configure administrative distance 1. Enable BGP and assign the AS number in CONFIGURATION mode, from 0.1 to 65535.65535 or 1 to 4294967295. OS10# configure terminal OS10(config)# router bgp 100 2. Use one of the following commands to enter the respective ADDRESS-FAMILY mode from ROUTER-BGP mode: IPv4: address-family ipv4 unicast 522 Layer 3