H3C Technologies H3C S6800 Series Switches - Manual (Page 155)

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device and all its neighbors have the RSVP GR capability and have exchanged GR parameters, each of
them can function as the GR helper of another device.
A GR helper considers that a GR restarter is rebooting when it does not receive hellos or receives
erroneous hellos from the restarter in three consecutive hello intervals. When a GR restarter is rebooting,
the GR helpers perform the following tasks:
• Retain soft state information about the GR restarter.
• Continue sending hello packets periodically to the GR restarter until the restart timer expires.
If a GR helper receives a hello message from the GR restarter before the restart timer expires, the recovery
timer is started and signaling packet exchange is triggered to restore the original soft state. Otherwise,
all RSVP soft state information and forwarding entries relevant to the neighbor are removed. When the
recovery timer expires, soft state information and forwarding entries that are not restored are removed.
Protocols and standards
• RFC 2205, Resource ReSerVation Protocol
• RFC 3209, RSVP-TE: Extensions to RSVP for LSP Tunnels
• RFC 2961, RSVP Refresh Overhead Reduction Extensions
RSVP configuration task list
Tasks at a glance
(Required.) Enabling RSVP
(Optional.) Perform the following tasks on each node of an MPLS TE tunnel according to your network
requirements:
• Configuring RSVP refresh
• Configuring RSVP Srefresh and reliable RSVP message delivery
• Configuring RSVP hello extension
• Configuring RSVP authentication
• Specifying a DSCP value for outgoing RSVP packets
• Configuring RSVP GR
• Enabling BFD for RSVP
Enabling RSVP
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable global RSVP and enter
RSVP view.
rsvp
By default, global RSVP is
disabled.
3. Return to system view. quit N/A
4. Enter interface view.
interface interface-type
interface-number
N/A