Huawei Quidway NetEngine80E Configuration Manual page 918

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Item
Status codes
Origin
Network
NextHop
MED
LocPrf
Issue 02 (2014-09-30)
Description
Route status code, displayed in front of each route entry:
l *: indicates a valid route with a reachable next hop address.
l >: indicates an optimal route selected by BGP.
l d: indicates a dampened route.
l h: indicates a History route.
l i: indicates a route learned from an IBGP peer.
l s: indicates a suppressed route. If specific routes for route summarization
are suppressed, s is displayed in front of each specific route.
l S: indicates a route in Stale status, and the route is being deleted. Such
routes may occur during a BGP GR process.
BGP dampening measures route stability using a penalty value. The greater
the penalty value, the less stable a route. Each time route flapping occurs (a
device receives a Withdraw or an Update packet), BGP adds a penalty value
to the route carried in the packet.
When the penalty value of a route exceeds the Suppress value, BGP
suppresses the route by replacing the > sign of the route with the d or h sign.
The route is ignored and its Update packets are not advertised to other BGP
peers until the penalty value of the route decreases to the Reuse value.
l If d is displayed in front of a route, the route is carried in an Update packet.
l If h is displayed in front of a route, the route is carried in a Withdraw
packet.
The penalty value is not increased after it reaches the suppression threshold.
The penalty value of a suppressed route reduces by half after a half-life period.
l When the penalty value of a route with the d sign decreases to the Reuse
value, the route becomes reusable, and BGP removes the d sign, adds the
route to the IP routing table, and advertises an Update packet carrying the
route to BGP peers.
l When the penalty value of a route with the h sign decreases to 0, BGP
deletes this route from the BGP routing table.
Route origin code, displayed in front of each route entry:
l IGP: indicates that routes are added to the BGP routing table using the
network (BGP) command.
l EGP: indicates that routes are learned through the EGP protocol.
l Incomplete: indicates that routes are added to the BGP routing table using
the import-route (BGP) command.
Network address in the BGP routing table
Next hop address
MED value of a BGP route, similar to the cost of IGP routes
Local_Pref
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8 BGP Configuration
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