Assuming that the attached image is what you are trying to do, sure.
R1:
ip vrf BLUE
rd 1:1
!
ip vrf RED
rd 101:1
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface FastEthernet0/0
ip vrf forwarding BLUE
ip address 10.2.2.1 255.255.255.0
!
interface FastEthernet0/1
ip vrf forwarding RED
ip address 10.3.3.1 255.255.255.0
!
!
router bgp 1
no bgp default ipv4-unicast
bgp log-neighbor-changes
!
address-family ipv4 vrf RED
neighbor 10.3.3.3 remote-as 3
neighbor 10.3.3.3 local-as 101
neighbor 10.3.3.3 activate
no synchronization
exit-address-family
!
address-family ipv4 vrf BLUE
neighbor 10.2.2.2 remote-as 2
neighbor 10.2.2.2 activate
no synchronization
exit-address-family
!
R2:
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 10.2.2.2 255.255.255.0
!
router bgp 2
no synchronization
bgp log-neighbor-changes
network 2.2.2.2 mask 255.255.255.255
neighbor 10.2.2.1 remote-as 1
no auto-summary
!
R3:
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/1
ip address 10.3.3.3 255.255.255.0
!
router bgp 3
no synchronization
bgp log-neighbor-changes
network 3.3.3.3 mask 255.255.255.255
neighbor 10.3.3.1 remote-as 101
no auto-summary
!
You see the routes in the VRFs and in the VPV4 address-family:
R1#sho ip bgp vpnv4 all
BGP table version is 5, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 1:1 (default for vrf BLUE)
*> 2.2.2.2/32 10.2.2.2 0 0 2 i
Route Distinguisher: 101:1 (default for vrf RED)
*> 3.3.3.3/32 10.3.3.3 0 0 101 3 i
Note that the route in the RED VRF includes the AS for the local-as in the
path.
Matthew
On Fri, Nov 25, 2011 at 10:08 AM, Amir Khalili <[email protected]> wrote:
> Thanks guys. I am using address family under the same process.
> Trying to peer using a diff AS number. Kind of eBGP approach. Would
> local AS serve the purpose?
>
> On 11/24/11, Matthew Mengel <[email protected]> wrote:
> > Not sure if the firewall or the VRF are really important (just as to
> > whether you are needing to use address-family or not).
> >
> > Also, not exactly sure what you mean by "fake" an AS. However, if what
> you
> > mean is that you have a situation where RouterB is expecting to peer with
> > AS 5, but you are running AS 1:
> >
> > RouterB#sho run | sec bgp
> > router bgp 2
> > no synchronization
> > bgp log-neighbor-changes
> > neighbor 10.0.0.1 remote-as 5
> > no auto-summary
> >
> > You can masquerade as AS 5 while remaining configured as AS 1 using the
> > "local-as" command:
> >
> > RouterA#sho run | sec bgp
> > router bgp 1
> > no synchronization
> > bgp log-neighbor-changes
> > neighbor 10.0.0.2 remote-as 2
> > neighbor 10.0.0.2 local-as 5
> > no auto-summary
> >
> > If, however, you mean that you have two VRFs on the same router,
> hairpinned
> > through a firewall, then I think you are sunk, as this uses
> > address-families under the bgp process, and unless I am mistaken, it is
> one
> > process with one AS per router.
> >
> > M.
> >
> >
> >
> > On Fri, Nov 25, 2011 at 8:09 AM, Amir Khalili <[email protected]>
> wrote:
> >
> >> Hello
> >>
> >> How can we fake AS # for a bgp neighbor to make ebgp peer? This is
> using
> >> in vrf bgp router id in a vrf.
> >>
> >> BGP vrf A -> FW -> BGP vrf B ( ebg peer )
> >>
> >> Cheers
> >> Amir
> >> _______________________________________________
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> please
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> >>
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> >
> >
> >
> > --
> > Matthew Mengel
> > [email protected]
> >
>
> --
> Sent from my mobile device
>
--
Matthew Mengel
[email protected]
_______________________________________________
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