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7.8

BGP Advice needed.

Asked by MarkJenks in Network Routers, Network Design & Methodology

Tags: cisco, bgp, ios, multi-homed

Looking for some advise to make sure that this is setup the way it needs to be.

2 Cisco 3825 Routers, 1gb ram each.

3 ISP's (1 - 4.5mb, 1 - 10mb, 1 - 15mb)

Just brought the 3rd ISP online, and am going to take down the 4.5MB when the contract expires.

Traffic is moving in all directions right now just fine.  Inbound is load sharing between the 3825, and with the OSPF shared path, outbound is also sharing.

My concern is that I am getting lots of inconsistent-as entries.  I know that the BGP for the new ISP has only been announced for about 1.5 weeks, but I'm wonder if there is more work to do here.  We are moving our data center behind this connection in a few weeks, so I get time to work though any issues now.

I was wondering if I need to use more route-maps to clean up which traffic goes into which direction.

Any thoughts or concerns?

-Mark 
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ROUTER1:
 
interface Loopback1
 ip address 2.2.120.253 255.255.255.255
!
interface Null0
 no ip unreachables
!
interface GigabitEthernet0/0
 bandwidth 150000
 ip address 8.8.126.38 255.255.255.252
 ip access-group inbound-acl in
 no ip unreachables
 no ip proxy-arp
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/1
 ip address 2.2.120.2 255.255.255.128
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 xxxxxx
 duplex auto
 speed auto
 media-type rj45
!
router ospf 100
 log-adjacency-changes
 network 2.2.120.0 0.0.0.127 area 2.2.120.0
 default-information originate always
!
router bgp xx497
 no synchronization
 bgp log-neighbor-changes
 bgp dampening
 network 2.2.120.0
 network 2.2.120.0 mask 255.255.255.0
 neighbor 2.2.120.254 remote-as xx497
 neighbor 2.2.120.254 update-source Loopback1
 neighbor 2.2.120.254 next-hop-self
 neighbor 8.8.126.37 remote-as x663
 neighbor 8.8.126.37 soft-reconfiguration inbound
 neighbor 8.8.126.37 prefix-list input-route-filter in
 neighbor 8.8.126.37 prefix-list announce-out out
 no auto-summary
!
ip forward-protocol nd
ip route 2.2.120.0 255.255.255.0 Null0
ip route 2.2.120.0 255.255.255.128 GigabitEthernet0/1
ip route 2.2.120.254 255.255.255.255 2.2.120.1
!
!
ip access-list extended inbound_acl
 remark - Block Efficient Short Remote Operations
 deny   udp any eq 259 any
 deny   udp any any eq 259
 remark - Block SNMP
 deny   udp any any range snmp snmptrap
 deny   tcp any any range 161 162
 remark - Block Cisco SNMP Ports
 deny   udp any any eq 1993
 deny   tcp any any eq 1993
 remark - Block SMUX
 deny   udp any any eq 199
 deny   tcp any any eq 199
 remark - Block SynOptics SNMP Relay Port
 deny   udp any any eq 391
 deny   tcp any any eq 391
 remark - Block AgentX
 deny   tcp any any eq 705
 remark - Filter RFC 1918 Addresses
 deny   ip host 0.0.0.0 any
 deny   ip 10.0.0.0 0.255.255.255 any
 deny   ip 127.0.0.0 0.255.255.255 any
 deny   ip 172.16.0.0 0.15.255.255 any
 deny   ip 192.168.0.0 0.0.255.255 any
 deny   ip 224.0.0.0 0.0.31.255 any
 deny   ip 255.0.0.0 0.255.255.255 any
 remark -  additional addresses
 deny   ip 0.0.0.0 0.255.255.255 any
 deny   ip 169.254.0.0 0.0.255.255 any
 deny   ip 192.0.2.0 0.0.0.255 any
 deny   ip any 224.0.0.0 31.255.255.255
 remark - Anti Spoofing Filter
 deny   ip 2.2.120.0 0.0.0.255 any
 deny   ip host 8.8.126.38 host 8.8.126.38
 remark - Permit IP Addresses Assigned by ISP
 permit ip any 2.2.120.0 0.0.0.255
 remark - Allow traffic to the routers external interface
 permit ip any host 8.8.126.38
 remark -  Block Remaining Traffic
 deny   ip any any
!
!
ip prefix-list AdvertisedNetworks seq 10 permit 2.2.120.0/24
!
ip prefix-list DEFAULT-ONLY seq 100 permit 0.0.0.0/0
!
ip prefix-list announce-out seq 10 permit 2.2.120.0/24 le 32
ip prefix-list announce-out seq 20 deny 0.0.0.0/0 le 32
!
ip prefix-list input-route-filter seq 10 deny 10.0.0.0/8 le 32
ip prefix-list input-route-filter seq 25 deny 127.0.0.0/8 le 32
ip prefix-list input-route-filter seq 40 deny 169.254.0.0/16 le 32
ip prefix-list input-route-filter seq 45 deny 2.2.120.0/24 le 32
ip prefix-list input-route-filter seq 70 deny 192.168.0.0/16 le 32
ip prefix-list input-route-filter seq 85 deny 224.0.0.0/3 le 32
ip prefix-list input-route-filter seq 90 permit 0.0.0.0/0 le 24
ip prefix-list input-route-filter seq 100 permit 0.0.0.0/0
 
 
ROUTER2:
!
interface Loopback1
 ip address 2.2.120.254 255.255.255.255
!
interface Null0
 no ip unreachables
!
interface GigabitEthernet0/0
 bandwidth 100000
 ip address 4.4.33.22 255.255.255.252
 ip access-group inbound_acl in
 no ip unreachables
 no ip proxy-arp
 ip route-cache flow
 load-interval 30
 duplex auto
 speed auto
 media-type rj45
!
interface GigabitEthernet0/1
 ip address 2.2.120.161 255.255.255.240 secondary
 ip address 2.2.120.1 255.255.255.128
 ip route-cache flow
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 7 xxxxx
 load-interval 30
 duplex auto
 speed auto
 media-type rj45
!
interface Serial0/0/0:0
 ip address 3.3.255.218 255.255.255.252
 ip access-group inbound_acl in
 no ip unreachables
 no ip proxy-arp
 encapsulation ppp
 ip route-cache flow
 load-interval 30
!
interface Serial0/0/1:0
 ip address 3.3.255.210 255.255.255.252
 ip access-group inbound_acl in
 no ip unreachables
 no ip proxy-arp
 encapsulation ppp
 ip route-cache flow
 load-interval 30
!
interface Serial0/1/0:0
 ip address 3.3.255.214 255.255.255.252
 ip access-group inbound_acl in
 no ip unreachables
 no ip proxy-arp
 encapsulation ppp
 ip route-cache flow
 load-interval 30
!
router ospf 100
 log-adjacency-changes
 network 2.2.120.0 0.0.0.127 area 2.2.120.0
 default-information originate always
!
router bgp xx497
 no synchronization
 bgp log-neighbor-changes
 bgp dampening
 network 2.2.120.0
 network 2.2.120.0 mask 255.255.255.0
 neighbor 5.5.5.236 remote-as x018
 neighbor 5.5.5.236 ebgp-multihop 2
 neighbor 5.5.5.236 update-source Loopback1
 neighbor 5.5.5.236 soft-reconfiguration inbound
 neighbor 5.5.5.236 prefix-list DEFAULT-ONLY in
 neighbor 5.5.5.236 prefix-list announce-out out
 neighbor 5.5.5.236 route-map Advertised_ISP1 out
 neighbor 4.4.33.21 remote-as x017
 neighbor 4.4.33.21 password 7 xxxxxx
 neighbor 4.4.33.21 soft-reconfiguration inbound
 neighbor 4.4.33.21 prefix-list input-route-filter in
 neighbor 4.4.33.21 prefix-list announce-out out
 neighbor 2.2.120.253 remote-as xx497
 neighbor 2.2.120.253 update-source Loopback1
 neighbor 2.2.120.253 next-hop-self
 no auto-summary
!
ip forward-protocol nd
ip route 5.5.5.236 255.255.255.255 3.3.255.217
ip route 5.5.5.236 255.255.255.255 3.3.255.213
ip route 5.5.5.236 255.255.255.255 3.3.255.209
ip route 2.2.120.0 255.255.255.0 Null0
ip route 2.2.120.0 255.255.255.128 GigabitEthernet0/1
 
ip route 2.2.120.253 255.255.255.255 2.2.120.2
!
 
!
ip access-list extended inbound_acl
 remark - Block Efficient Short Remote Operations
 deny   udp any eq 259 any
 deny   udp any any eq 259
 remark - Block SNMP
 deny   udp any any range snmp snmptrap
 deny   tcp any any range 161 162
 remark - Block Cisco SNMP Ports
 deny   udp any any eq 1993
 deny   tcp any any eq 1993
 remark - Block SMUX
 deny   udp any any eq 199
 deny   tcp any any eq 199
 remark - Block SynOptics SNMP Relay Port
 deny   udp any any eq 391
 deny   tcp any any eq 391
 remark - Block AgentX
 deny   tcp any any eq 705
 remark - Filter RFC 1918 Addresses
 deny   ip host 0.0.0.0 any
 deny   ip 10.0.0.0 0.255.255.255 any
 deny   ip 127.0.0.0 0.255.255.255 any
 deny   ip 172.16.0.0 0.15.255.255 any
 deny   ip 192.168.0.0 0.0.255.255 any
 deny   ip 224.0.0.0 0.0.31.255 any
 deny   ip 255.0.0.0 0.255.255.255 any
 remark -  additional addresses
 deny   ip 0.0.0.0 0.255.255.255 any
 deny   ip 169.254.0.0 0.0.255.255 any
 deny   ip 192.0.2.0 0.0.0.255 any
 deny   ip any 224.0.0.0 31.255.255.255
 remark - Anti Spoofing Filter
 deny   ip 2.2.120.0 0.0.0.255 any
 deny   ip host 4.4.33.22 host 4.4.33.22
 deny   ip host 3.3.255.210 host 3.3.255.210
 deny   ip host 3.3.255.214 host 3.3.255.214
 deny   ip host 3.3.255.218 host 3.3.255.218
 remark - Permit IP Addresses Assigned by ISP
 permit ip any 2.2.120.0 0.0.0.255
 remark - Allow traffic to the routers external interface
 permit ip any host 4.4.33.22
 permit ip any host 3.3.255.210
 permit ip any host 3.3.255.214
 permit ip any host 3.3.255.218
 remark -  Block Remaining Traffic
 deny   ip any any
!
!
ip prefix-list AdvertisedNetworks seq 10 permit 2.2.120.0/24
!
ip prefix-list DEFAULT-ONLY seq 100 permit 0.0.0.0/0
!
ip prefix-list announce-out seq 10 permit 2.2.120.0/24 le 32
ip prefix-list announce-out seq 20 deny 0.0.0.0/0 le 32
!
ip prefix-list input-route-filter seq 10 deny 10.0.0.0/8 le 32
ip prefix-list input-route-filter seq 25 deny 127.0.0.0/8 le 32
ip prefix-list input-route-filter seq 40 deny 169.254.0.0/16 le 32
ip prefix-list input-route-filter seq 45 deny 2.2.120.0/24 le 32
ip prefix-list input-route-filter seq 70 deny 192.168.0.0/16 le 32
ip prefix-list input-route-filter seq 85 deny 224.0.0.0/3 le 32
ip prefix-list input-route-filter seq 90 permit 0.0.0.0/0 le 24
ip prefix-list input-route-filter seq 100 permit 0.0.0.0/0
 
!
route-map Advertised_ISP1 permit 10
 match ip address prefix-list AdvertisedNetworks
 set as-path prepend xx497 xx497 xx497
!
route-map Advertised_ISP2 permit 10
 match ip address prefix-list AdvertisedNetworks
[+][-]06/16/09 09:27 AM, ID: 24639629Expert Comment

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[+][-]06/16/09 10:06 AM, ID: 24640012Expert Comment

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[+][-]06/16/09 10:29 AM, ID: 24640247Author Comment

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[+][-]06/16/09 10:45 AM, ID: 24640412Expert Comment

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[+][-]06/16/09 11:02 AM, ID: 24640563Author Comment

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[+][-]06/16/09 02:28 PM, ID: 24642793Accepted Solution

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About this solution

Zones: Network Routers, Network Design & Methodology
Tags: cisco, bgp, ios, multi-homed
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Solution Provided By: mikebernhardt
Participating Experts: 1
Solution Grade: A
 
 
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