305
Step
Command
Remarks
2.
Enter BGP instance view or
BGP-VPN instance view.
•
Enter BGP instance view:
bgp
as-number
[
instance
instance-name
]
•
Enter BGP-VPN instance view:
a. bgp
as-number
[
instance
instance-name
]
b. ip vpn-instance
vpn-instance-name
N/A
3.
Enable BFD to detect the link to the
specified BGP peer or peer group.
peer
{
group-name
|
ipv4-address
[
mask-length
] }
bfd
[
multi-hop
|
single-hop
]
By default, BFD is
disabled.
To enable BFD for a BGP peer (IPv6 unicast/multicast address family):
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter BGP instance view or
BGP-VPN instance view.
•
Enter BGP instance view:
bgp
as-number
[
instance
instance-name
]
•
Enter BGP-VPN instance view:
a. bgp
as-number
[
instance
instance-name
]
b. ip vpn-instance
vpn-instance-name
N/A
3.
Enable BFD to detect the link to the
specified IPv6 BGP peer or peer
group.
peer
{
group-name
|
ipv6-address
[
prefix-length
] }
bfd
[
multi-hop
|
single-hop
]
By default, BFD is
disabled.
Configuring BGP FRR
When a link fails, the packets on the link are discarded, and a routing loop might occur until BGP
completes routing convergence based on the new network topology.
You can enable BGP fast reroute (FRR) to resolve this issue.
Figure 66 Network diagram for BGP FRR
After you configure FRR on Router B as shown in
, BGP generates a backup next hop
Router C for the primary route. BGP uses ARP (for IPv4), echo-mode BFD (for IPv4), or ND (for IPv6)
to detect the connectivity to Router D. When the link to Router D fails, BGP directs packets to the
backup next hop. At the same time, BGP calculates a new optimal route, and forwards packets over
the optimal route.
You can use the following methods to configure BGP FRR:
Backup nexthop: Router C
Router E
Nexthop: Router D
Router A
Router B
Summary of Contents for HPE FlexNetwork 7500 series
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