JUNOS_VRF

Ciscoはルーティングテーブルを分割する方法としてVRFがあるけど、JUNOSはVRFとVirtual Routerの2種類の方法がある。

　Virtual Routerの方は比較的探しやすいので、今回はVRFの方をやってみる。

構成はこんな感じ

[vSRX][ge-0/0/0]----------[Gi2][CSR1kv]

ついでにBGPの設定をいれてみて確認まで

まずはとっつきやすいCiscoの方から
Config

 !
ip vrf VRF1
　rd 65000:1
　route-target export 65000:1
　route-target import 65000:1
!
interface Loopback0
　ip vrf forwarding VRF1
　ip address 1.1.1.1 255.255.255.255
!
interface GigabitEthernet2
　ip vrf forwarding VRF1
　ip address 10.1.1.1 255.255.255.0
　negotiation auto
!
router bgp 65000
　bgp log-neighbor-changes
　!
　address-family ipv4 vrf VRF1
　 network 1.1.1.1 mask 255.255.255.255
　 neighbor 10.1.1.2 remote-as 65001
　 neighbor 10.1.1.2 activate
　 neighbor 10.1.1.2 soft-reconfiguration inbound
　exit-address-family
!

 次はvSRXの方

set interfaces ge-0/0/0 unit 0 family inet address 10.1.1.2/24
set interfaces lo0 unit 0 family inet address 2.2.2.2/32

set routing-options autonomous-system 65001

set policy-options prefix-list LOCAL 2.2.2.2/32
set policy-options policy-statement To_BGP term 1 from prefix-list LOCAL
set policy-options policy-statement To_BGP term 1 then accept

# Cisco の ip vrf VRF1
set routing-instances VRF1 instance-type vrf
# Ciscoの ip forwarding vrf
set routing-instances VRF1 interface ge-0/0/0.0
set routing-instances VRF1 interface lo0.0
set routing-instances VRF1 route-distinguisher 65000:1
set routing-instances VRF1 vrf-target import target:65000:1
set routing-instances VRF1 vrf-target export target:65000:1
set routing-instances VRF1 protocols bgp peer-as 65000
set routing-instances VRF1 protocols bgp group ext type external
set routing-instances VRF1 protocols bgp group ext export To_BGP
set routing-instances VRF1 protocols bgp group ext neighbor 10.1.1.1

これでBGPが張られているかを確認してみる
Cisco

#show bgp vpnv4 unicast vrf VRF1 neighbors 10.1.1.2
BGP neighbor is 10.1.1.2, vrf VRF1, remote AS 65001, external link
　　BGP version 4, remote router ID 2.2.2.2
　　BGP state = Established, up for 00:03:23
　　Last read 00:00:04, last write 00:00:15, hold time is 90, keepalive interval is 30 seconds
　　Neighbor sessions:
～～略～～

 JUNOS

 # run show bgp neighbor
Peer: 10.1.1.1+20970 AS 65000 Local: 10.1.1.2+179 AS 65001
　　Group: ext Routing-Instance: VRF1
　　Forwarding routing-instance: VRF1
　　Type: External State: Established Flags: <Sync>
　　Last State: OpenConfirm Last Event: RecvKeepAlive
　　Last Error: None
　　Export: [ To_BGP ]
　　Options: <Preference PeerAS Refresh>
　　Holdtime: 90 Preference: 170
　　Number of flaps: 4
　　Last flap event: TransportError
　　Peer ID: 192.168.2.202 Local ID: 2.2.2.2 Active Holdtime: 90
　　Keepalive Interval: 30 Group index: 1 Peer index: 0 SNMP index: 2

～～略～～

問題なさそう。
では実際にCisco側でJUNOSが広告した2.2.2.2が見えるか確認

#show ip route vrf VRF1 bgp　　　　　　　　
　　　2.0.0.0/32 is subnetted, 1 subnets
B　　　　2.2.2.2 [20/0] via 10.1.1.2, 00:15:26

JUNOS側では、Ciscoが広告した1.1.1.1が見えるか確認

# run show route protocol bgp　　　　　　　　　

inet.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)

VRF1.inet.0: 4 destinations, 4 routes (4 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

1.1.1.1/32　　　　 *[BGP/170] 00:10:41, MED 0, localpref 100
　　　　　　　　　　　AS path: 65000 I, validation-state: unverified
　　　　　　　　　　> to 10.1.1.1 via ge-0/0/0.0

おわり