Bgp Configuration Tasks - Huawei Quidway S5600 Series Operation Manual

Operation Manual – Routing Protocol
Quidway S5600 Series Ethernet Switches-Release 1510
II. Extended attribute of MP-BGP
Of different types of BGP-4 packets, all the information concerning to IPv4 are carried
by Update packets. The information is hold by NLRI, Next_Hop (in the AS_Path
attribute), and Aggregator (in the AS_Path attribute). (The Aggregator attribute
contains the IP address of the BGP speaker that generates a aggregated route.)
To support multiple network layer protocols, NLRI and Next_Hop need to hold the
information about the network layers. To achieve this, the following two path-related
attributes are added in MP-BGP.
MP_REACH_NLRI, which stands for multiprotocol reachable NLRI and is used to
advertise reachable routes and next hop information.
MP_UNREACH_NLRI, which stands for multiprotocol unreachable NLRI and is
used to withdraw unreachable routes.
The two attributes are all of the optional non-transitive type. Therefore, BGP speakers
that do not support multiple protocols ignore the information carried in the two attributes
and do not pass the information to their neighbors.
5.1.6 Protocol Standard
Protocol standards concerning BGP are:
RFC1771: A border gateway protocol 4 (BGP-4)
RFC2858: Multiprotocol extensions for BGP-4
RFC3392: Capabilities advertisement with BGP-4
RFC2918: Route refresh capability for BGP-4
RFC2439: BGP route flap damping
RFC1997: BGP communities attribute
RFC2796: BGP route reflection
RFC3065: Autonomous system confederations for BGP
Others are still in draft, such as the graceful restart feature and the extended
community attribute.

5.2 BGP Configuration Tasks

Table 5-2 Introduction to BGP configurations
Basic BGP configuration
Configuring the
way
advertise/receiv
e
information
Configuration tasks
Importing routes
to
routing
Configuring route
aggregation
Huawei Technologies Proprietary
Description
Required
Optional
Optional
5-15
Chapter 5 BGP Configuration
Related section
Section 5.3 "Basic
BGP Configuration"
5.4.2 "Importing
Routes"
5.4.3
Section
"Configuring BGP
Route Aggregation"