HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 212
Configuring the AS_PATH attribute
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Step Command 4. Specify the router as the next hop for routes sent to a peer peer { group-name | or peer group. ipv6-address } next-hop-local Remarks By default, the router sets itself as the next hop for routes sent to an EBGP peer or peer group, but does not set itself as the next hop for routes sent to an IBGP peer or peer group. Configuring the AS_PATH attribute Permitting local AS number to appear in routes from a peer or peer group In general, BGP checks whether the AS_PATH attribute of a route from a peer contains the local AS number. If yes, it discards the route to avoid routing loops. In certain network environments (for example, a Hub&Spoke network in MPLS L3VPN), however, the AS_PATH attribute of a route from a peer must be allowed to contain the local AS number. Otherwise, the route cannot be advertised correctly. To permit the local AS number to appear in routes from a peer or peer group and specify the appearance times (IPv4): Step 1. Enter system view. 2. Enter BGP view or BGP-VPN instance view. 3. Enter BGP IPv4 unicast instance view or BGP-VPN IPv4 unicast instance view. 4. Permit the local AS number to appear in routes from a peer or peer group and specify the appearance times. Command system-view • Enter BGP view: bgp as-number • Enter BGP-VPN instance view: a. bgp as-number b. ip vpn-instance vpn-instance-name ipv4-family [ unicast ] peer { group-name | ip-address } allow-as-loop [ number ] Remarks N/A N/A N/A By default, the local AS number is not allowed in routes from a peer or peer group. To permit the local AS number to appear in routes from a peer or peer group and specify the appearance times (IPv6): Step 1. Enter system view. 2. Enter BGP view or BGP-VPN instance view. Command system-view • Enter BGP view: bgp as-number • Enter BGP-VPN instance view: a. bgp as-number b. ip vpn-instance vpn-instance-name Remarks N/A N/A 201
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