HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Routing Confi - Page 161
Setting the DSCP value for BGP packets, Enabling quick EBGP session reestablishment
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Step 1. Enter system view. 2. Enter BGP view. 3. Enable 4-byte AS number suppression. Command system-view bgp as-number peer { group-name | ip-address } capability-advertise suppress-4-byte-as Remarks N/A N/A Disabled by default. Setting the DSCP value for BGP packets An IPv4 packet header contains an 8-bit Type of Service (TOS) field. As defined in RFC 2474, the first six bits set the Differentiated Services Code Point (DSCP) value and the last two bits are reserved. Network devices use the DSCP value as a reference to determine the packet priority for transmission. You can set the DSCP value for BGP packets. To configure the DSCP value for packets sent to a BGP peer or peer group: Step 1. Enter system view. 2. Enter BGP view or BGP-VPN view. 3. Set the DSCP value for the BGP packets sent to the specified BGP peer or peer group. Command system-view • Enter BGP view: bgp as-number • Enter BGP-VPN instance view: a. bgp as-number b. ipv4-family vpn-instance vpn-instance-name peer { group-name | ip-address } dscp dscp-value Remarks N/A Use either approach. Optional. By default, the DSCP value in BGP packets is 48. Enabling quick EBGP session reestablishment If the router receives no keepalive messages from a BGP peer within the holdtime, it disconnects from the peer. With quick EBGP connection reestablishment enabled, the router will reestablish a session to the EBGP peer immediately when the link to a directly connected EBGP peer is down. To enable quick EBGP session reestablishment: Step 1. Enter system view. 2. Enter BGP view. 3. Enable quick EBGP session reestablishment. Command system-view bgp as-number ebgp-interface-sensitive Remarks N/A N/A Optional. Not enabled by default. 151
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