ISR Computing -

CCIE Security - BGP Related Topics

To allow BGP communication between 2 BGP routers through Cisco ASA firewall, the following configuration changes need to happen:

access-list OUTSIDE_IN permit tcp any any eq bgp
access-list OUTSIDE_IN in interface outside
tcp-map BGP_OPTIONS
 tcp-options range 19 19 allow
access-list BGP_TRAFFIC permit tcp any any eq bgp
access-list BGP_TRAFFIC permit tcp any eq bgp any
class-map BGP_CLASS
 match access-list BGP_TRAFFIC
policy-map global_policy
 class BGP_CLASS
  set connection advanced-options BGP_OPTIONS
  set connection random-sequence-number disable

BGP Path Attributes:

Weight
Local-Pref
Originate (local)
AS Path
Origin
MED
Path
Router-id

BGP Messages:

Open
Update
Notification
Keepalive
Route-refresh

BGP Finite-State Machine Operation (FSM):

Idle
Connect
Active
Open-sent
Open-confirm
Established.

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