Example Configurations

From AS4

Peering and policy configuration for 32-bit ASNs is usually the same as the configuration for 16-bit ASNs. Here are some examples to get you started.

Contents 1 Brocade (Foundry) IronWare 2 Cisco IOS 3 Cisco IOS XR 4 Juniper JUNOS 5 Force10 FTOS 6 Quagga

Brocade (Foundry) IronWare

Version: 4.0.00 (with AS4 support)

router bgp
 local-as 80000
 neighbor 192.168.1.1 remote-as 70000

Cisco IOS

Version: 12.4(12) (no AS4 support)

router bgp 64510
 neighbor 1.2.3.2 remote-as 64509
 neighbor 1.2.3.2 description AS2 peer
 neighbor 1.2.3.10 remote-as 23456
 neighbor 1.2.3.10 description AS4 peer

(with AS4 support using asplain)

router bgp 65537
 neighbor 1.2.3.1 remote-as 64510
 neighbor 1.2.3.1 description AS2 peer
 neighbor 1.2.3.5 remote-as 65538
 neighbor 1.2.3.5 description AS4 peer

(with AS4 support using asdot)

router bgp 1.1
 bgp asnotation dot
 neighbor 1.2.3.1 remote-as 64510
 neighbor 1.2.3.1 description AS2 peer
 neighbor 1.2.3.5 remote-as 1.2
 neighbor 1.2.3.5 description AS4 peer

Cisco IOS XR

(The following example is meant to do exactly what the IOS example does.)

prefix-set global-v4 0.0.0.0/0 le 32
end-set
!
route-policy v4-in
 if destination in global-v4 then
 pass
 endif
end-policy
!
route-policy v4-out
 if destination in global-v4 then
 pass
 endif
end-policy
!
router bgp 1.1
 neighbor 1.2.3.1
 remote-as 64510
 description AS2 peer
 address-family ipv4 unicast
 route-policy v4-in in
 route-policy v4-out out
 !
 neighbor 1.2.3.5 
 remote-as 1.2
 description AS4 peer
 address-family ipv4 unicast
 route-policy v4-in in
 route-policy v4-out out

Juniper JUNOS

Version: 8.5R4.3 (no AS4 support, AS_TRANS is shown in the AS path in CLI output instead of 23456)

neighbor 72.37.255.13 {
    ! Only if using EBGP multihop
    multihop {
        ttl 50;
    }
    family inet {
        unicast {
            prefix-limit {
                maximum 10;
            }
        }
    }
    peer-as 23456;
}

Version: 9.3R1.7 (with AS4 support)

neighbor 72.37.255.13 {
   ! Only if using EBGP multihop
    multihop {
        ttl 50;
    }
    family inet {
        unicast {
            prefix-limit {
                maximum 10;
            }
        }
    }
    peer-as 393222;
}

Force10 FTOS

Version: 7.8.1.0

router bgp 100000
 bgp router-id 24.30.77.224
 ! This command will be added automagically if a 4-byte ASN is used as the router\'s ASN
 bgp four-octet-as-support
 neighbor 72.37.255.13 remote-as 393222
 ! Only if using EBGP multihop
 neighbor 72.37.255.13 ebgp-multihop 255
 neighbor 72.37.255.13 soft-reconfiguration inbound
 neighbor 72.37.255.13 no shutdown

Quagga

Version: 0.99.11

router bgp 100000
 bgp router-id 192.168.0.12
 neighbor 72.37.255.13 remote-as 393222
 ! Only if using EBGP multihop
 neighbor 72.37.255.13 ebgp-multihop 255
 neighbor 72.37.255.13 soft-reconfiguration inbound