Static Route Resolve Configuration(Juniper vMX)

1. Static Route Resolve Configuration 구성도

1) Static Route Resolve Configuration 구성도

• Next-Hop Resolve란, Indirect Next-Hop일 때 Indirect Next-Hop으로 가는 Route를 찾기 위해 라우팅 테이블을 Recursive Lookup 하는 기능
• Next-Hop이 Direct일 경우, Juniper는 Forwarding Table 및 ARP Table에 Next-Hop에 대한 IP 및 MAC Address 정보가 존재하므로 Recursive Lookup이 불필요
• Juniper와 Nokia는 Next-Hop Resolve 기능이 기본적으로 Disable되어 있어 사용하려면 옵션 설정 필요

 

2) 테스트 장비

• Emulator : EVE-NG
• OS : Juniper vMX 18.2R1.9

 

 

2. Static Route Resolve Configuration

1) Interface IP Address Configuration

< R1 : Interface IP 설정 >
set interfaces ge-0/0/0 unit 0 family inet address 1.1.3.1/24
set interfaces ge-0/0/1 unit 0 family inet address 1.1.2.1/24
set interfaces lo0 unit 0 family inet address 1.1.1.1/32

< R2 : Interface IP 설정 >
set interfaces ge-0/0/0 unit 0 family inet address 1.1.2.2/24
set interfaces ge-0/0/1 unit 0 family inet address 1.2.3.2/24
set interfaces lo0 unit 0 family inet address 2.2.2.2/32

< R3 : Interface IP 설정 >
set interfaces ge-0/0/0 unit 0 family inet address 1.2.3.3/24
set interfaces ge-0/0/1 unit 0 family inet address 1.1.3.3/24
set interfaces lo0 unit 0 family inet address 3.3.3.3/32

 

2) Static Route Resolve Configuration

< R1 : Static Route 설정 >
set routing-options static route 3.3.3.3/32 next-hop 2.2.2.2
set routing-options static route 2.2.2.2/32 next-hop 1.1.3.3

root@R1> show route protocol static table inet.0 

inet.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

2.2.2.2/32         *[Static/5] 00:00:18
                    > to 1.1.3.3 via ge-0/0/0.0

• Juniper는 기본적으로 Resolve 기능이 Disable되어 있어 Indirect Next-Hop 설정 시, Indirect Next-Hop으로 가야 Route를 모르기 때문에 라우팅 테이블에 해당 Entry 생성 불가

 

< R1 : Static Route Resolve Option 설정 >
set routing-options static route 3.3.3.3/32 resolve

root@R1> show route protocol static table inet.0 

inet.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

2.2.2.2/32         *[Static/5] 00:01:00
                    > to 1.1.3.3 via ge-0/0/0.0
3.3.3.3/32         *[Static/5] 00:00:14, metric2 0
                    > to 1.1.3.3 via ge-0/0/0.0

• Resolve를 설정하여 Indirect Next-Hop으로 가는 경로를 Recursive Lookup하여 Indirect Next-Hop으로 가기 위한 Direct Next-Hop이 무엇인지 확인하여 라우팅 테이블에 해당 Entry를 생성