Difference between revisions of "Cisco BGP"
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Timers | Timers | ||
tim bg 10 30 20 | tim bg 10 30 20 | ||
| + | |||
| + | ===Dampening=== | ||
| + | route-map selective_dampening permit 10 | ||
| + | set dampening 5 1900 2000 10 | ||
| + | 5=half-life, 1900=reuse-limit, 2000=suppress-limit, 10 max-suppress-limit | ||
| + | router bgp [ASN] | ||
| + | bgp dampening route-map selective_dampening | ||
| + | |||
| + | show ip bgp flap-statistics | ||
===Show=== | ===Show=== | ||
Revision as of 13:08, 18 September 2015
Border Gateway Protocol (RFC 4271) är ett path vector routing protokoll. Det kommunicerar på TCP port 179 så routing måste vara på plats, man kan nästan se det som ett L4-protokoll. BGP kan få många vägar till samma destination. Bästa vägen väljs utifrån en algoritm. http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html
Contents
States
TCP
Idle State
ConnectRetry timer 120 sekunder
Active State
BGP speaker försöker nå peer med TCP
Connect State
TCP session established
BGP
OpenSent State
BGP version, AS number, hold time, BGP ID
Börja skicka keepalives
OpenConfirm State
Response recieved
Established State
Skicka uppdateringar
Neighbor up
Konfiguration
router bgp [ASN] no auto-summary
iBGP eller eBGP
neighbor [ip-address] remote-as [ASN]
Loopback
neighbor [ip-address] update-source [interface]
eBGP om det ej är directly connected, t.ex. loopback
neighbor [ip-address] ebgp-multihop 2 neighbor [ip-address] next-hop-self
MD5
neighbor [ip-address] password cisco
network [ip-address] mask [subnet-mask]
bgp default local-preference 100
Synchronization is enabled by default in Cisco IOS Software Release prior to 12.2(8)T.
no synchronization
Timers
tim bg 10 30 20
Dampening
route-map selective_dampening permit 10 set dampening 5 1900 2000 10
5=half-life, 1900=reuse-limit, 2000=suppress-limit, 10 max-suppress-limit
router bgp [ASN] bgp dampening route-map selective_dampening
show ip bgp flap-statistics
Show
show ip bgp summary show ip bgp neighbor
Reset
clear ip bgp *
