Huawei Quidway S5600 Series Operation Manual page 364

Operation Manual – Routing Protocol
Quidway S5600 Series Ethernet Switches-Release 1510
Caution:
A router must be assigned a router ID in order to run BGP protocol. A router ID is a
32-bit unsigned integer. It uniquely identifies a router in an AS.
To configure basic functions of BGP peer group, you need to create the BGP peer
group first. Refer to section 5.7.2 "Configuring BGP Peer Group" for information
about creating a BGP peer group.
The router ID can be manually configured. If you do not specify a router ID, the
system automatically choose the IP address of one of its interfaces as the router ID.
In this case, the least loopback interface IP address is most preferred. If no
loopback interface is configured, the least interface IP address is chosen as the
router ID. For network reliability consideration, you are recommended to configure
the IP address of a loopback interface as the router ID.
In order for route updating packets being sent even if problems occur on interfaces,
you can configure the source interfaces of route update packets as a loopback
interface.
Normally, EBGP peers are connected through directly connected physical links. If
no such link exists, you need to use the peer ebgp-max-hop command to allow the
peers to establish multiple-hop TCP connections between them. If loopback
interfaces are used to establish connections between EBGP peers, the peer
ebgp-max-hop command is unnecessary.
5.4 Configuring the Way to Advertise/Receive Routing
Information
5.4.1 Configuration Prerequisites
Make sure the following operation is performed before configuring the way to
advertise/receive BGP routing information.
Enabling the basic BGP functions
Make sure the following information is available when you configure the way to
advertise/receive BGP routing information.
The aggregation mode, and the aggregated route.
Access list number
Filtering direction (advertising/receiving) and the route policies to be adopted.
Route dampening settings, such as half-life and the thresholds.
Huawei Technologies Proprietary
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Chapter 5 BGP Configuration