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The configuration of BGP4+ Load-balance In MSR Series

2008-10-13 发表
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The configuration of BGP4+ Load-balance In MSR Series

 

Keywords: MSR;BGP4+;IPv4;Load-Banance

I            Requirement for the diagram

RTA connect RTB, RTC through EBGP, connect RouterD through IBGP. Import static routing of 9::/32 to RTB, RTC. There is load-balance between RTB and RTC.

Device List: 4 MSR;

CMW Version: Version 5.20, Beta 1105

II          Network topology

 

Figure 1 BGP4+ Static Equal Routing and Load-balance

III        Steps of configuration

RTA

 

#

 ipv6

#

interface Ethernet0/0

 port link-mode route

 ipv6 address 2::1/96

#

interface Ethernet0/1

 port link-mode route

 ipv6 address 1::1/96

#

//change interface e0/3 to route mode of MSR20-21

interface Ethernet0/3

 port link-mode route

 ipv6 address 3::1/96

#

interface LoopBack0

 ipv6 address 1:1:1::1/128

//set EBGP, IBGP

#

bgp 200

 undo synchronization

 #

 ipv6-family

  network 1:1:1::1 128

  import-route direct

  undo synchronization

  //set load-balance number to 2

balance 2

  peer 1::2 as-number 100

  peer 2::2 as-number 100

                peer 3::2 as-number 200

RTB

#

 ipv6

#

interface Ethernet0/1

 port link-mode route

 ipv6 address 1::2/96

#

interface LoopBack0

 ipv6 address 2:2:2::2/128

//EBGP

#

bgp 100        

 undo synchronization

 #

 ipv6-family

  network 2:2:2::2 128

  import-route static

  undo synchronization

  peer 1::1 as-number 200

//routing to NULL address

#

 ipv6 route-static 9:: 32 NULL0

 

RTC

#

 ipv6

#

interface LoopBack0

 ipv6 address 3:3:3::3/128

#

interface GigabitEthernet0/0

 port link-mode route

 ipv6 address 2::2/96

#

bgp 100

 undo synchronization

 #

 ipv6-family  

  network 3:3:3::3 128

  import-route static

  undo synchronization

  peer 2::1 as-number 200

#

 ipv6 route-static 9:: 32 NULL0

#

return

 

RTD

#

 ipv6

#

interface LoopBack0

 ipv6 address 4:4:4::4/128

#

interface GigabitEthernet0/0

 port link-mode route

 ipv6 address 3::2/96

#

bgp 200

 undo synchronization

 #

 ipv6-family

  network 4:4:4::4 128

  import-route direct

  undo synchronization

             peer 3::1 as-number 200

 

IV       Key notes in the configuration

After configuring BGP4+, config blow command on RTB and RTC:

ipv6 route-static 9:: 32 NULL0

Import this routing info to BGP.

V         Result Check

After configuration, there is equal routing to 9::32, when other enviroment is equal, system will choose the smaller address as next hop:

    [RTA-2021-bgp-af-ipv6]dis ipv6 rou

Routing Table :

        Destinations : 14      Routes : 14

 

Destination: ::1/128                                    Protocol : Direct

NextHop   : ::1                                        Preference: 0

Interface : InLoop0                                    Cost     : 0

 

Destination: 1::/96                                     Protocol : Direct

NextHop   : 1::1                                       Preference: 0

Interface : Eth0/1                                     Cost     : 0

 

Destination: 1::1/128                                   Protocol : Direct

NextHop   : ::1                                        Preference: 0

Interface : InLoop0                                    Cost     : 0

 

Destination: 1:1:1::1/128                               Protocol : Direct

NextHop   : ::1                                        Preference: 0

Interface : InLoop0                                    Cost     : 0

 

Destination: 2::/96                                     Protocol : Direct

NextHop   : 2::1                                       Preference: 0

Interface : Eth0/0                                     Cost     : 0

 

Destination: 2::1/128                                   Protocol : Direct

NextHop   : ::1                                        Preference: 0

Interface : InLoop0                                    Cost     : 0

 

Destination: 2:2:2::2/128                               Protocol : BGP4+

NextHop   : 1::2                                       Preference: 255

Interface : Eth0/1                                     Cost     : 0

 

Destination: 3::/96                                     Protocol : Direct

NextHop   : 3::1                                        Preference: 0

Interface : Eth0/3                                     Cost     : 0

 

Destination: 3::1/128                                   Protocol : Direct

NextHop   : ::1                                        Preference: 0

Interface : InLoop0                                    Cost     : 0

 

Destination: 3:3:3::3/128                               Protocol : BGP4+

NextHop   : 2::2                                       Preference: 255

Interface : Eth0/0                                      Cost     : 0

 

Destination: 4:4:4::4/128                               Protocol : BGP4+

NextHop   : 3::2                                       Preference: 255

Interface : Eth0/3                                     Cost     : 0

 

Destination: 9::/32                                     Protocol : BGP4+

NextHop   : 1::2                                       Preference: 255

Interface : Eth0/1                                     Cost     : 0

 

Destination: FE80::/10                                  Protocol : Direct

NextHop   : ::                                         Preference: 0

Interface : NULL0                                      Cost     : 0

 

When set route of load-balance to 2, system will add 2 routing info to routing table:

    [RTA-2021]dis bgp ipv routing-table

 

 Total Number of Routes: 11

 

 BGP Local router ID is 1.0.0.1

 Status codes: * - valid, > - best, d - damped,

               h - history, i - internal, s - suppressed, S - Stale

               Origin : i - IGP, e - EGP, ? - incomplete

-------------------------------------

When balance value is 2:

 *> Network : 1::                                     PrefixLen : 96   

     NextHop : 1::1                                    LocPrf   :        

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: ?

 

 *> Network : 1:1:1::1                                PrefixLen : 128  

     NextHop : ::1                                     LocPrf   :        

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: i

 

 *> Network : 2::                                     PrefixLen : 96   

     NextHop : 2::1                                    LocPrf   :        

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: ?

 

 *> Network : 2:2:2::2                                 PrefixLen : 128  

     NextHop : 1::2                                    LocPrf   :        

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: 100 i

 

 *> Network : 3::                                     PrefixLen : 96   

     NextHop : 3::1                                    LocPrf   :        

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: ?

 

 * i Network : 3::                                     PrefixLen : 96   

     NextHop : 3::2                                    LocPrf   : 100     

     PrefVal : 0                                        Label    : NULL    

     MED    : 0                                       

     Path/Ogn: ?

 

 *> Network : 3:3:3::3                                PrefixLen : 128  

     NextHop : 2::2                                    LocPrf   :        

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: 100 i

 

 *>i Network : 4:4:4::4                                PrefixLen : 128  

     NextHop : 3::2                                    LocPrf   : 100     

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: i

 

 *> Network : 9::                                     PrefixLen : 32   

     NextHop : 1::2                                    LocPrf   :        

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: 100 ?

 

 *> Network : 9::                                     PrefixLen : 32   

     NextHop : 2::2                                    LocPrf   :        

     PrefVal : 0                                       Label    : NULL    

     MED    : 0                                      

     Path/Ogn: 100 ?

 

 

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