Re: [OSL | CCIE_RS] BGP design question

 Which this would most certainly cover his strange requirement of manual
switchback.

On the other hand, could we run like IOS 10.3 or something?B i seem to
recall that more things were less automagical back then! (smirk)

B

Scott

Marko Milivojevic wrote:

  Now, expanding on this we need solve additional requirement from the
  original post. How to prevent peer from coming back up. Well, for that
  we could probably use EEM. Let's take a look.
  
  event manager applet DISABLE_PEER
   event routing network 2.2.2.2/32 type remove
   action 10 cli command "enable"
   action 20 cli command "configure terminal"
   action 30 cli command "router bgp 1"
   action 40 cli command "neighbor 2.2.2.2 shutdown"
   action 50 cli command "end"
  !
  
  Enabling peer on R2.
  
  R1#sh ip bgp sum
  BGP router identifier 1.1.1.1, local AS number 1
  BGP table version is 1, main routing table version 1
  
  Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ
  Up/Down State/PfxRcd
  2.2.2.2 4 2 6 5 1 0 0
  00:00:37 0
  
  Killing the interface on R2 here.
  
  *Mar 29 01:33:59.679: %TRACKING-5-STATE: 1 ip sla 1 reachability Up->Down
  *Mar 29 01:33:59.683: %BGP-5-ADJCHANGE: neighbor 2.2.2.2 Down Route to peer lost
  *Mar 29 01:33:59.747: %SYS-5-CONFIG_I: Configured from console by on
  vty0 (EEM:DISABLE_PEER)
  
  --
  Marko Milivojevic - CCIE #18427
  Senior Technical Instructor - IPexpert
  
  YES! We include 400 hours of REAL rack
  time with our Blended Learning Solution!
  
  Mailto: markom_at_ipexpert.com Telephone: +1.810.326.1444
  Fax: +1.810.454.0130
  Web: http://www.ipexpert.com/
  On Sun, Mar 28, 2010 at 17:05, Marko Milivojevic <markom_at_ipexpert.com> wrote:

    On Sun, Mar 28, 2010 at 17:00, Narbik Kocharians <narbikk_at_gmail.com> wrote:

      Totally understand that, but i did not see any mention of OSPF or ISIS.

    Enjoy.
    
    R1:
    
    interface Loopback0
    B ip address 1.1.1.1 255.255.255.255
    !
    interface FastEthernet0/0
    B ip address 12.12.12.1 255.255.255.0
    !
    ip sla 1
    B icmp-echo 12.12.12.2
    B frequency 5
    !
    ip sla schedule 1 start-time now life forever
    !
    track 1 ip sla 1 reachability
    B default-state down
    !
    ip route 2.2.2.2 255.255.255.255 12.12.12.2 track 1
    !
    route-map Neighbor-Alive
    B match source-protocol static
    !
    router bgp 1
    B neighbor 2.2.2.2 remote-as 2
    B neighbor 2.2.2.2 update-source Loopback0
    B neighbor 2.2.2.2 ebgp-multihop 2
    B neighbor 2.2.2.2 fall-over route-map Neighbor-Alive
    !
    
    R2:
    
    interface GigabitEthernet0/0
    B ip address 12.12.12.2 255.255.255.0
    !
    router bgp 2
    B neighbor 1.1.1.1 remote-as 1
    B neighbor 1.1.1.1 ebgp-multihop 2
    B neighbor 1.1.1.1 update-source Loopback0
    !
    
    Notice what happens on R1 as soon as I shut down the port on R2 (there
    is a switch between them).
    
    *Mar 29 00:59:19.679: %TRACKING-5-STATE: 1 ip sla 1 reachability Up->Down
    *Mar 29 00:59:19.683: %BGP-5-ADJCHANGE: neighbor 2.2.2.2 Down Route to peer lost

    --
    Marko Milivojevic - CCIE #18427
    Senior Technical Instructor - IPexpert
    
    YES! We include 400 hours of REAL rack
    time with our Blended Learning Solution!
    
    Mailto: markom_at_ipexpert.com Telephone: +1.810.326.1444
    Fax: +1.810.454.0130
    Web: http://www.ipexpert.com/

  Blogs and organic groups at http://www.ccie.net
  _______________________________________________________________________
  Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sun Mar 28 2010 - 16:58:17 ART