Cisco ASR 9000 Series Routing Configuration Guide

Repair" (A6), the ios_msg is printed only once per neighbor per action. This is irrespective of the number of
malformed updates received since the neighbor last reached an "Established" state.
This is a sample BGP error handling syslog message:
%ROUTING-BGP-3-MALFORM_UPDATE : Malformed UPDATE message received from neighbor 13.0.3.50
- message length 90 bytes,
error flags 0x00000840, action taken "TreatAsWithdraw".
Error details: "Error 0x00000800, Field "Attr-missing", Attribute 1 (Flags 0x00, Length 0),
Data []"
This is a sample BGP attribute filtering syslog message for the "discard attribute" action:
[4843.46]RP/0/0/CPU0:Aug 21 17:06:17.919 : bgp[1037]: %ROUTING-BGP-5-UPDATE_FILTERED :
One or more attributes were filtered from UPDATE message received from neighbor 40.0.101.1
- message length 173 bytes,
action taken "DiscardAttr".
Filtering details: "Attribute 16 (Flags 0xc0): Action "DiscardAttr"". NLRIs: [IPv4 Unicast]
88.2.0.0/17
This is a sample BGP attribute filtering syslog message for the "treat-as-withdraw" action:
[391.01]RP/0/0/CPU0:Aug 20 19:41:29.243 : bgp[1037]: %ROUTING-BGP-5-UPDATE_FILTERED :
One or more attributes were filtered from UPDATE message received from neighbor 40.0.101.1
- message length 166 bytes,
action taken "TreatAsWdr".
Filtering details: "Attribute 4 (Flags 0xc0): Action "TreatAsWdr"". NLRIs: [IPv4 Unicast]
88.2.0.0/17
BGP Link-State
BGP Link-State (LS) is an Address Family Identifier (AFI) and Sub-address Family Identifier (SAFI) defined
to carry interior gateway protocol (IGP) link-state database through BGP. BGP LS delivers network topology
information to topology servers and Application Layer Traffic Optimization (ALTO) servers. BGP LS allows
policy-based control to aggregation, information-hiding, and abstraction. BGP LS supports IS-IS and OSPFv2.
IGPs do not use BGP LS data from remote peers. BGP does not download the received BGP LS data to
any other component on the router.
Note
BGP Permanent Network
BGP permanent network feature supports static routing through BGP. BGP routes to IPv4 or IPv6 destinations
(identified by a route-policy) can be administratively created and selectively advertised to BGP peers. These
routes remain in the routing table until they are administratively removed.
A permanent network is used to define a set of prefixes as permanent, that is, there is only one BGP
advertisement or withdrawal in upstream for a set of prefixes. For each network in the prefix-set, a BGP
permanent path is created and treated as less preferred than the other BGP paths received from its peer. The
BGP permanent path is downloaded into RIB when it is the best-path.
The permanent-network command in global address family configuration mode uses a route-policy to identify
the set of prefixes (networks) for which permanent paths is to be configured. The advertise permanent-network
command in neighbor address-family configuration mode is used to identify the peers to whom the permanent
paths must be advertised. The permanent paths is always advertised to peers having the advertise
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
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Implementing BGP
BGP Link-State

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English