HP VPN Firewall Appliances Network Management Command Reference

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Usage guidelines
Neither the default route nor the routes imported using the network command can be summarized
automatically.
The summary automatic command helps BGP limit the number of routes redistributed from IGP to reduce
the size of the routing table.
Examples
# In BGP view, enable automatic route summarization.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] summary automatic
# In BGP-VPN instance view, enable automatic summarization (the VPN has been created).
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv4-family vpn-instance vpn1
[Sysname-bgp-ipv4-vpn1] summary automatic
synchronization (BGP view)
Use synchronization to enable the synchronization between the BGP and IGP routes.
Use undo synchronization to disable the synchronization.
Syntax
synchronization
undo synchronization
Default
The feature is disabled.
Views
BGP view
Default command level
2: System level
Usage guidelines
With this feature enabled and when a non-BGP router is responsible for forwarding packets in an AS,
BGP speakers in the AS cannot advertise routing information to other ASs unless all routers in the AS
know the latest routing information.
When a BGP router receives an IBGP route, it checks only whether the next hop is reachable by default.
If the synchronization is enabled, the IBGP route is synchronized and advertised to EBGP peers only
when the route is also advertised by IGP. Otherwise, the IBGP route cannot be advertised to EBGP peers.
Examples
# Enable the synchronization between BGP and IGP routes.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] synchronization