✎ en:jobs:bgp_basic_configuration [IT Notes about: Juniper, Cisco, Checkpoint, FreeBSD, Linux, Windows, VmWare, VDI, Cloud....]

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======= Configuring BGP on Cisco router and Juniper SRX. =======
 ==== Introduction. ====

You have [[http://en.wikipedia.org/wiki/Multihoming|multihomed network]] (two and more ISPs) and you need to reliable connection and fixed network address space for your services.\\
**Solution** - [[https://en.wikipedia.org/wiki/Border_Gateway_Protocol|BGP protocol]], PI (Provider Independent) Network, AS (Autonomous System).\\
 ==== Preparation. ====

For obtaining PI Network and AS you need to send request to any company with [[https://www.arin.net/policy/nrpm.html#two4|LIR]] status (Usually ISP have a LIR status). This process takes about two-three months. \\
So, you have obtained you AS and PI Network. For example AS - 47668, PI NETWORK - 91.208.39.0/24 and you have two connected ISPs: 
  *   ISP-1 8359
  *   ISP-2 8629

{{:ru:jobs:bgp.jpg?400|400}}

Now you need to request your LIR and all of your connected ISPs for adding import/export records to RIPE or ARIN database. All of ISPs using RIPE and ARIN database for routing filters configuration.\\
You can check RIPE database record using this [[https://apps.db.ripe.net/search/full-text.html|link]] and typing your AS (for example 47668) and each ISPs AS (for example AS8359, AS8629).\\
You should see the following import/export records:

  aut-num:        AS47668
  as-name:        SCANEX-AS
  descr:          LLC "R&D Center ScanEx"
  org:            ORG-SRaD1-RIPE
  import:         from AS8359 accept ANY
  import:         from AS8629 accept ANY
  export:         to AS8359 announce AS47668
  export:         to AS8629 announce AS47668

ISP-1:
  
  aut-num:        AS8359
  as-name:        MTS
  descr:          MTS OJSC
  descr:          former CJSC COMSTAR-Direct
  descr:          Smolenskaya-Sennaya Sq., 27 block 2
  descr:          119121 Moscow, Russia
  org:            ORG-ZM1-RIPE
  import:         from AS47668 action pref=105; accept AS47668
  export:         to AS47668 announce ANY

ISP-2:

  aut-num:        AS8629
  as-name:        MCNTT-AS
  descr:          MCNTT Autonomous System
  descr:          Moscow Center of New Telecommunication Technologies
  descr:          Arbat 46, 121002 Moscow
  import:         from AS47668 action pref=300; accept AS47668
  export:         to AS47668 announce ANY

Now you can start to configure network infrastructure.
 

 ==== Configure. ====

This article will observe the process of configuration BGP on Juniper SRX  and Cisco Router 
Let's assume:
  *   EXT_IP_1 - IP address of external interface that connected to ISP-1 
  *   EXT_IP_2 - IP address of external interface that connected to ISP-2
  *   91.208.39.1/24 - IP address of intefaces that connected to 91.208.39.0/24 network 
  *   ISP_IP_1 - IP address of router of ISP-1
  *   ISP_IP_2 - IP address of router of ISP-2
  *   ISP-1    - main ISP
  *   ISP-2    - reserve ISP


 ==== Configuring BGP on Cisco Router 2911 ====

  
  en
  conf t

**1. Access lists**
  
  
  ip access-list extended SCANEX_IN_ISP1_FILTER
  deny ip 10.0.0.0 0.255.255.255 any
  deny ip 172.16.0.0 0.15.255.255 any
  deny ip 192.168.0.0 0.255.255.255 any
  permit tcp host ISP_IP_1 host EXT_ISP_IP_1 eq 179
  permit tcp any host EXT_ISP_IP_1 established
  permit icmp any any
  deny ip any host 91.208.39.1 
  permit ip any 91.208.39.0 0.255.255.255
  deny ip any any
  exit


  ip access-list extended SCANEX_IN_ISP2_FILTER
  deny ip 10.0.0.0 0.255.255.255 any
  deny ip 172.16.0.0 0.15.255.255 any
  deny ip 192.168.0.0 0.255.255.255 any
  permit tcp host ISP_IP_2 host EXT_ISP_IP_2 eq 179
  permit tcp any host EXT_ISP_IP_2 established
  permit icmp any any
  deny ip any host 91.208.39.1 
  permit ip any 91.208.39.0 0.255.255.255
  deny ip any any
  exit

  ip access-list extended SCANEX_IN_GL_NET_FILTER
  deny ip 10.0.0.0 0.255.255.255 any
  deny ip 172.16.0.0 0.15.255.255 any
  deny ip 192.168.0.0 0.255.255.255 any
  permit tcp any host 91.208.39.1 established
  permit icmp any any
  !don't forget to add ssh access to cisco
  deny ip any host 91.208.39.1 
  permit ip 91.208.39.0 0.255.255.255 any
  deny ip any any
  exit

  ip access-list standard ISP-in
  deny 10.0.0.0 0.255.255.255
  deny 172.16.0.0 0.15.255.255
  deny 192.168.0.0 0.0.255.255
  deny 91.208.39.0 0.0.0.255
  permit any
  exit
  
  ip access-list standard ISP-out
  permit 91.208.39.0 0.0.0.255
  exit


**2. Interfaces**
 
  int gi 0/0
  ip address EXT_ISP_IP_1
  ip access-group SCANEX_IN_ISP1_FILTER in
  no shutdown 
  exit
 
  int gi 0/1
  ip address EXT_ISP_IP_2
  ip access-group SCANEX_IN_ISP2_FILTER in
  no shutdown 
  exit
  
  int gi 0/2
  ip address 91.208.39.1 255.255.255.0
  ip access-group SCANEX_IN_GL_NET_FILTER in
  no shutdown 
  exit

**3. Static routes**

At starting or reloading of BGP the routing table is empty. The process of downloading full list of global routes takes about two minutes. Solution is set main ISP as static default gateway.
    
 ip route 0.0.0.0 0.0.0.0 ISP_IP_1

**4. Route maps**

  route-map set-as-path permit 10
  match ip address ISP-out
  set as-path prepend 47668 47668 47668 47668 47668

**5. BGP**

   router bgp 47668
   bgp router-id 91.208.39.1
   network 91.208.39.0/24
   neighbor ISP_IP_1 remote-as 8629
   neighbor ISP_IP_1 weight 200
   neighbor ISP_IP_1 distribute-list ISP-in in
   neighbor ISP_IP_1 distribute-list ISP-out out
   neighbor ISP_IP_2 remote-as 8359
   neighbor ISP_IP_2 weight 100
   neighbor ISP_IP_2 distribute-list ISP-in in
   neighbor ISP_IP_2 distribute-list ISP-out out
   neighbor ISP_IP_2 route-map set-as-path out
   exit


**6. Write configuration**
  
  do wr
    
 ==== Configuring BGP on Juniper SRX 220H ====

**1. Interfaces**

  set interfaces ge-0/0/1 
  set interfaces ge-0/0/1 unit 0 description ISP-1
  set interfaces ge-0/0/1 unit 0 family inet address EXT_IP_1
  set interfaces ge-0/0/1 unit 0 family inet filter input SCANEX_IN_ISP1_FILTER
   
  
  set interfaces ge-0/0/2 
  set interfaces ge-0/0/2 unit 0 description ISP-2
  set interfaces ge-0/0/2 unit 0 family inet address EXT_IP_2
  set interfaces ge-0/0/2 unit 0 family inet filter input SCANEX_IN_ISP2_FILTER
  
  
  set interfaces ge-0/0/3 
  set interfaces ge-0/0/3 unit 0 description My Global
  set interfaces ge-0/0/3 unit 0 family inet address 91.208.39.1/24
  set interfaces ge-0/0/3 unit 0 family inet filter input SCANEX_IN_GL_NET_FILTER


**2. Static routes**

At starting or reloading of BGP the routing table is empty. The process of downloading full list of global routes takes about two minutes. Solution is set main ISP as static default gateway.
    
  set routing-options static route 0.0.0.0/0 next-hop IP_ISP_1 

**3. Security Zones**

  set security zones security-zone ISPs host-inbound-traffic system-services ping
  set security zones security-zone ISPs host-inbound-traffic protocols bgp
  set security zones security-zone ISPs interfaces ge-0/0/1.0
  set security zones security-zone ISPs interfaces ge-0/0/2.0
  
  set security zones security-zone SCANEX_GL_NET_LAN host-inbound-traffic system-services ping
  set security zones security-zone SCANEX_GL_NET_LAN interfaces ge-0/0/3.0
  

**4. Security Polices**

  set security policies default-policy permit-all

**5. Policy Options**

  ## term 1 will be used to extend a return path (for secondary ISP)
  set policy-options policy-statement ASPREPEND term 1 from route-filter 91.208.39.0/24 exact
  set policy-options policy-statement ASPREPEND term 1 then as-path-prepend "47668 47668 47668 47668 47668 47668"
  set policy-options policy-statement ASPREPEND term 1 then reject
  set policy-options policy-statement ASPREPEND term 2 from route-filter 0.0.0.0/0 exact
  set policy-options policy-statement ASPREPEND term 2 then reject
  set policy-options policy-statement ASPREPEND term 3 then reject
  
  set policy-options policy-statement ISP-in term 1 from route-filter 91.208.39.0/24 exact
  set policy-options policy-statement ISP-in term 1 then reject
  ## term 2-4 will be used to defend from possible ISPs mistakes
  set policy-options policy-statement ISP-in term 2 from route-filter 192.168.0.0/16 exact
  set policy-options policy-statement ISP-in term 2 then reject
  set policy-options policy-statement ISP-in term 3 from route-filter 172.16.0.0/12 exact
  set policy-options policy-statement ISP-in term 3 then reject
  set policy-options policy-statement ISP-in term 4 from route-filter 10.0.0.0/8 exact
  set policy-options policy-statement ISP-in term 4 then reject
  set policy-options policy-statement ISP-in term 5 from route-filter 0.0.0.0/0 exact
  set policy-options policy-statement ISP-in term 5 then accept
  
  set policy-options policy-statement ISP-out term 1 from route-filter 91.208.39.0/24 exact
  set policy-options policy-statement ISP-out term 1 then accept
  set policy-options policy-statement ISP-out term 2 from route-filter 0.0.0.0/0 exact
  set policy-options policy-statement ISP-out term 2 then reject
  set policy-options policy-statement ISP-out term 3 then reject


**6. BGP**

  set protocols bgp group MTS_BGP type external
  ## There is no BGP attribute of Weight in the Junos world, since Weight is Cisco proprietary.
  set protocols bgp group MTS_BGP preference 180
  set protocols bgp group MTS_BGP import ISP-in
  set protocols bgp group MTS_BGP export ASPREPEND
  set protocols bgp group MTS_BGP export ISP-out
  set protocols bgp group MTS_BGP neighbor ISP_IP_2 peer-as 8359
  set protocols bgp group MCNTT_BGP type external
  set protocols bgp group MCNTT_BGP import ISP-in
  set protocols bgp group MCNTT_BGP export ISP-out
  set protocols bgp group MCNTT_BGP neighbor ISP_IP_1 peer-as 8629

**7. Firewall**
  
  set firewall filter SCANEX_IN_ISP1_FILTER term 1 from source-address 10.0.0.0/8
  set firewall filter SCANEX_IN_ISP1_FILTER term 1 from source-address 172.16.0.0/12
  set firewall filter SCANEX_IN_ISP1_FILTER term 1 from source-address 192.168.0.0/16
  set firewall filter SCANEX_IN_ISP1_FILTER term 1 then discard
  set firewall filter SCANEX_IN_ISP1_FILTER term 2 from source-address ISP_IP_1
  set firewall filter SCANEX_IN_ISP1_FILTER term 2 from destination-address EXT_ISP_IP_1
  set firewall filter SCANEX_IN_ISP1_FILTER term 2 from protocol tcp
  set firewall filter SCANEX_IN_ISP1_FILTER term 2 from destination-port 179
  set firewall filter SCANEX_IN_ISP1_FILTER term 2 then accept
  set firewall filter SCANEX_IN_ISP1_FILTER term 3 from tcp-established
  set firewall filter SCANEX_IN_ISP1_FILTER term 3 then accept
  set firewall filter SCANEX_IN_ISP1_FILTER term 4 from protocol icmp
  set firewall filter SCANEX_IN_ISP1_FILTER term 4 then accept
  set firewall filter SCANEX_IN_ISP1_FILTER term 5 from destination-address EXT_ISP_IP_1
  set firewall filter SCANEX_IN_ISP1_FILTER term 5 from destination-address EXT_ISP_IP_2
  set firewall filter SCANEX_IN_ISP1_FILTER term 5 from destination-address 91.208.39.1
  set firewall filter SCANEX_IN_ISP1_FILTER term 5 then discard
  set firewall filter SCANEX_IN_ISP1_FILTER term 100 from destination-address 91.208.39.0/24
  set firewall filter SCANEX_IN_ISP1_FILTER term 100 then accept
  set firewall filter SCANEX_IN_ISP1_FILTER term 200 then discard

  set firewall filter SCANEX_IN_ISP2_FILTER term 1 from source-address 10.0.0.0/8
  set firewall filter SCANEX_IN_ISP2_FILTER term 1 from source-address 172.16.0.0/12
  set firewall filter SCANEX_IN_ISP2_FILTER term 1 from source-address 192.168.0.0/16
  set firewall filter SCANEX_IN_ISP2_FILTER term 1 then discard
  set firewall filter SCANEX_IN_ISP2_FILTER term 2 from source-address ISP_IP_2
  set firewall filter SCANEX_IN_ISP2_FILTER term 2 from destination-address EXT_ISP_IP_2
  set firewall filter SCANEX_IN_ISP2_FILTER term 2 from protocol tcp
  set firewall filter SCANEX_IN_ISP2_FILTER term 2 from destination-port 179
  set firewall filter SCANEX_IN_ISP2_FILTER term 2 then accept
  set firewall filter SCANEX_IN_ISP2_FILTER term 3 from tcp-established
  set firewall filter SCANEX_IN_ISP2_FILTER term 3 then accept
  set firewall filter SCANEX_IN_ISP2_FILTER term 4 from protocol icmp
  set firewall filter SCANEX_IN_ISP2_FILTER term 4 then accept
  set firewall filter SCANEX_IN_ISP2_FILTER term 5 from destination-address EXT_ISP_IP_2
  set firewall filter SCANEX_IN_ISP2_FILTER term 5 from destination-address EXT_ISP_IP_1
  set firewall filter SCANEX_IN_ISP2_FILTER term 5 then discard
  set firewall filter SCANEX_IN_ISP2_FILTER term 100 from destination-address 91.208.39.0/24
  set firewall filter SCANEX_IN_ISP2_FILTER term 100 then accept
  set firewall filter SCANEX_IN_ISP2_FILTER term 200 then discard

  set firewall filter SCANEX_IN_GL_NET_FILTER term 1 from source-address 10.0.0.0/8
  set firewall filter SCANEX_IN_GL_NET_FILTER term 1 from source-address 172.16.0.0/12
  set firewall filter SCANEX_IN_GL_NET_FILTER term 1 from source-address 192.168.0.0/16
  set firewall filter SCANEX_IN_GL_NET_FILTER term 1 then discard
  set firewall filter SCANEX_IN_GL_NET_FILTER term 2 from tcp-established
  set firewall filter SCANEX_IN_GL_NET_FILTER term 2 then accept
  set firewall filter SCANEX_IN_GL_NET_FILTER term 3 from protocol icmp
  set firewall filter SCANEX_IN_GL_NET_FILTER term 3 then accept
  ## don't forget to add ssh access to SRX
  set firewall filter SCANEX_IN_GL_NET_FILTER term 4 from destination-address 91.208.39.1
  set firewall filter SCANEX_IN_GL_NET_FILTER term 4 from destination-address EXT_ISP_IP_1
  set firewall filter SCANEX_IN_GL_NET_FILTER term 4 from destination-address EXT_ISP_IP_2
  set firewall filter SCANEX_IN_GL_NET_FILTER term 4 then discard
  set firewall filter SCANEX_IN_GL_NET_FILTER term 100 then accept

**8. Commit**

  commit