BGP IPv6 Flowspec 구성
소개
이 문서에서는 ASR1K에서 BGP(Border Gateway Protocol) IPv6 Flowspec을 구성하는 방법에 대해 설명합니다.
사전 요구 사항
요구 사항
Cisco에서는 이 주제에 대해 알고 있는 것이 좋습니다.
- 플랫폼 독립적
사용되는 구성 요소
이 문서의 정보는 다음 소프트웨어 및 하드웨어 버전을 기반으로 합니다.
- IOS-XE
- ASR1000
- ASR9K
- ASR1K
- BGP
- Flowspec
- IPv6
이 문서의 정보는 특정 랩 환경의 디바이스를 토대로 작성되었습니다.이 문서에 사용된 모든 디바이스는 초기화된(기본) 컨피그레이션으로 시작되었습니다.네트워크가 작동 중인 경우 모든 명령의 잠재적인 영향을 이해해야 합니다.
배경 정보
Flowspec은 BGP를 통해 플로우 사양 규칙의 분포를 위한 절차를 지정하며, 모든 애플리케이션에서 사용할 수 있는 BGP NLRI(Border Gateway Protocol Network Layer Reachability Information)로 흐름 사양 규칙을 인코딩하는 절차를 정의합니다.또한 서비스 거부 공격을 완화(분산)하기 위해 패킷 필터링을 목적으로 애플리케이션을 정의합니다.
제한 사항
컨피그레이션의 제한 사항은 다음과 같습니다.
- flowspec 규칙에서는 주소군을 혼합할 수 없습니다.
- 다중 일치 시나리오에서는 첫 번째 일치 flowspec 규칙만 적용됩니다.
- 시스템당 최대 3000개의 flowspec 규칙이 지원됩니다.
구성
이 예에서는 ASR9K를 컨트롤러로 구성하고 ASR1K를 PE, RR 및 Flowspec 클라이언트로 구성했습니다.
이는 IPv6 Flowspec이 작동하는 데 필요한 최소 컨피그레이션입니다.
On controller to push the policy to PE/client: class-map type traffic match-all FLOWSPEC match destination-address ipv6 2001:db8::/32 <<<<< Match destination address/subnet. end-class-map ! policy-map type pbr FS_P class type traffic FLOWSPEC <<<<< Apply class-map under policy-map. drop ! flowspec address-family ipv4 service-policy type pbr FSP_V4 ! address-family ipv6 service-policy type pbr FS_P <<<<< Apply policy-map inside Flowspec under AF. ! On PE/client is to enable IPv6 flowspec AF under BGP. address-family ipv6 flowspec <<<<< Under ipv6 flowspec AF, activate the neighbor. neighbor 10.192.202.5 activate neighbor 10.192.202.5 validation off To apply the flowspec policy on interface, "local-install interface-all" command is must under flowspec. flowspec local-install interface-all <<<<< Push the policy on interface.
- 컨트롤러 컨피그레이션에 따라 2001:db8::/32로 향하는 모든 트래픽은 정책에 따라 삭제되어야 합니다.
- ASR1K가 next-hop을 확인하지 않도록 ipv6 주소군 아래의 인접 디바이스에 대한 검증을 해제합니다.
- 정책이 작동 중인 경우, 컨트롤러가 카운터에 표시되지만 다른 디바이스에서 이 카운터를 보려면 flowspec 아래에 local-install interface-all 명령이 필요한 모든 사용자 인터페이스에 flowspec 정책을 설치하십시오.
문제 해결 중 과제
- 언더레이 네트워크가 IPv4이고 IPv6에 대해 BGP flowspec이 실행되는 경우 every-hop에 대한 유효성 검사 문제가 발생하여 IPv6 Flowspec 정책에 문제가 발생합니다.따라서 인접 디바이스가 유효성 검사를 수행하지 않도록 검증을 해제합니다.
- 컨트롤러 이외의 flowspec 정책 일치/작업 카운터는 볼 수 없습니다.카운터를 확인하려면 local-install interface-all이 Flowspec 아래에 있어야 합니다(AF 아래). 이 명령은 IPv4 및 IPv6 주소 패밀리에 대한 디바이스의 모든 인터페이스와 VRF 인스턴스 내의 인터페이스에서 플로우 사양 정책 컨피그레이션을 푸시합니다.
네트워크 다이어그램
+----------------+ +-----------------+ +------------------+ +-----------------+ | | | | | | | | | Controller +--------------+ PE/RR1 +------------+ PE/RR2 +-------------+ End-PE | | ASR9K | | CRR01 | | CRR02 | | DCPR01 | +----------------+ +-----------------+ +------------------+ +-----------------+
구성
이 컨피그레이션은 네트워크 다이어그램을 기반으로 하며, 이는 설정과 동일합니다.
Controller: RP/0/RSP0/CPU0:Controller# show running-config Mon Apr 8 16:33:36.578 UTC Building configuration... !! IOS XR Configuration 5.3.4 !! Last configuration change at Wed Apr 3 17:34:59 2019 by admin ! hostname Controller cdp cdp advertise v1 ! class-map type traffic match-all FLOWSPEC match destination-address ipv6 2001:db8::/32 end-class-map ! class-map type traffic match-all V4_FLOWSPEC match source-address ipv4 102.102.102.102 255.255.255.255 end-class-map ! policy-map type pbr FS_P class type traffic FLOWSPEC drop ! class type traffic class-default ! end-policy-map ! policy-map type pbr FSP_V4 class type traffic V4_FLOWSPEC set dscp ef ! class type traffic class-default ! end-policy-map ! interface Loopback0 ipv4 address 10.192.202.5 255.255.255.255 ! interface Loopback100 ipv4 address 102.102.102.102 255.255.255.255 ipv6 address 2001:db8::1/32 ! interface TenGigE0/0/0/0 ipv4 address 10.10.12.1 255.255.255.0 ipv6 address 2001:10:10:12::1/64 ! route-policy ALL pass end-policy ! router static address-family ipv4 unicast 203.202.143.33/32 TenGigE0/0/0/0 ! address-family ipv6 unicast 2003::/64 2001:10:10:12::2 ! ! router ospfv3 1 area 0 interface TenGigE0/0/0/0 network point-to-point ! ! ! router bgp 64696 bgp router-id 10.192.202.5 address-family ipv4 unicast network 102.102.102.102/32 ! address-family vpnv4 unicast ! address-family ipv4 flowspec ! address-family ipv6 flowspec ! neighbor 203.202.143.33 remote-as 7474 ebgp-multihop 10 update-source Loopback0 address-family ipv4 unicast route-policy ALL in route-policy ALL out ! address-family vpnv4 unicast ! address-family ipv4 flowspec route-policy ALL in route-policy ALL out ! address-family ipv6 flowspec route-policy ALL in route-policy ALL out ! ! ! flowspec local-install interface-all address-family ipv4 service-policy type pbr FSP_V4 ! address-family ipv6 service-policy type pbr FS_P ! ! end
PE/RR1: CRR01#show running-config Building configuration... ! ipv6 unicast-routing mpls label protocol ldp ! spanning-tree extend system-id flowspec local-install interface-all diagnostic bootup level minimal ! interface Loopback0 ip address 203.202.143.33 255.255.255.255 ip ospf 1 area 0 ! interface Loopback1010 no ip address ipv6 address 2001:DB8::10/32 ! interface TenGigabitEthernet0/0/0 ip address 10.10.12.2 255.255.255.0 ip ospf network point-to-point cdp enable ipv6 address 2001:10:10:12::2/64 ! interface TenGigabitEthernet0/0/3 ip address 10.10.23.2 255.255.255.0 ip ospf network point-to-point ip ospf 1 area 0 cdp enable ipv6 address 2003::1/64 mpls ip ! router ospf 1 mpls ldp autoconfig ! router bgp 7474 bgp router-id 203.202.143.33 bgp log-neighbor-changes neighbor 10.192.202.5 remote-as 64696 neighbor 10.192.202.5 ebgp-multihop 10 neighbor 10.192.202.5 update-source Loopback0 neighbor 2001:10:10:12::1 remote-as 64696 neighbor 203.202.143.44 remote-as 7474 neighbor 203.202.143.44 update-source Loopback0 ! address-family ipv4 neighbor 10.192.202.5 activate no neighbor 2001:10:10:12::1 activate neighbor 203.202.143.44 activate neighbor 203.202.143.44 route-reflector-client exit-address-family ! address-family ipv4 flowspec neighbor 10.192.202.5 activate neighbor 203.202.143.44 activate neighbor 203.202.143.44 send-community both neighbor 203.202.143.44 route-reflector-client exit-address-family ! address-family ipv6 neighbor 10.192.202.5 activate neighbor 203.202.143.44 activate neighbor 203.202.143.44 route-reflector-client neighbor 203.202.143.44 send-label exit-address-family ! address-family ipv6 flowspec neighbor 10.192.202.5 activate neighbor 10.192.202.5 validation off neighbor 203.202.143.44 activate neighbor 203.202.143.44 send-community both neighbor 203.202.143.44 route-reflector-client neighbor 203.202.143.44 next-hop-self exit-address-family ! ip route 10.192.202.5 255.255.255.255 10.10.12.1 ! ! ipv6 route 2001:DB8::1/128 2001:10:10:12::1 ! end
PE/RR2: CRR02#show running-config Building configuration... Current configuration : 7227 bytes ! ! Last configuration change at 18:21:29 UTC Mon Apr 8 2019 ! hostname CRR02 ! boot-start-marker boot system flash bootflash:asr1000rpx86-universalk9.16.10.01a.SPA.bin boot-end-marker ! ipv6 unicast-routing multilink bundle-name authenticated ! spanning-tree extend system-id flowspec diagnostic bootup level minimal ! interface Loopback0 ip address 203.202.143.44 255.255.255.255 ip ospf 1 area 0 ! interface TenGigabitEthernet1/0/0 ip address 10.10.23.3 255.255.255.0 ip ospf network point-to-point ip ospf 1 area 0 cdp enable ipv6 address 2003::2/64 mpls ip ! interface TenGigabitEthernet1/0/1 ip address 10.10.34.3 255.255.255.0 ip ospf network point-to-point ip ospf 1 area 0 cdp enable ! router ospf 1 mpls ldp autoconfig ! router bgp 7474 bgp router-id 203.202.143.44 bgp log-neighbor-changes neighbor 203.202.143.33 remote-as 7474 neighbor 203.202.143.33 update-source Loopback0 neighbor 203.202.143.45 remote-as 7474 neighbor 203.202.143.45 update-source Loopback0 ! address-family ipv4 neighbor 203.202.143.33 activate neighbor 203.202.143.45 activate exit-address-family ! address-family ipv4 flowspec neighbor 203.202.143.33 activate neighbor 203.202.143.45 activate neighbor 203.202.143.45 send-community both neighbor 203.202.143.45 route-reflector-client exit-address-family ! address-family ipv6 neighbor 203.202.143.33 activate neighbor 203.202.143.33 send-label exit-address-family ! address-family ipv6 flowspec neighbor 203.202.143.33 activate neighbor 203.202.143.33 validation off neighbor 203.202.143.45 activate neighbor 203.202.143.45 send-community both neighbor 203.202.143.45 route-reflector-client exit-address-family ! ipv6 route 2001:10:10:12::/64 2003::1 ipv6 route 2001:DB8::1/128 2003::1 ! end
End-PE: DCPR01#show running-config Building configuration... ! hostname DCPR01 ! subscriber templating ! ipv6 unicast-routing ! flowspec diagnostic bootup level minimal ! interface Loopback0 ip address 203.202.143.45 255.255.255.255 ip ospf 1 area 0 ! interface TenGigabitEthernet1/3/0 ip address 10.10.34.4 255.255.255.0 ip ospf network point-to-point ip ospf 1 area 0 cdp enable ipv6 address 2001::1/64 ! router ospf 1 mpls ldp autoconfig ! router bgp 7474 bgp router-id 203.202.143.45 bgp log-neighbor-changes neighbor 203.202.143.44 remote-as 7474 neighbor 203.202.143.44 update-source Loopback0 ! address-family ipv4 flowspec neighbor 203.202.143.44 activate exit-address-family ! address-family ipv6 flowspec neighbor 203.202.143.44 activate neighbor 203.202.143.44 validation off exit-address-family ! ipv6 route ::/0 TenGigabitEthernet1/3/0 ! end
다음을 확인합니다.
PE/RR2: CRR02#ping 2001:db8::1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:DB8::1, timeout is 2 seconds: ..... Success rate is 0 percent (0/5) CRR02#
Controller:
RP/0/RSP0/CPU0:Controller#show bgp ipv6 flowspec
Mon Apr 8 17:55:17.041 UTC
BGP router identifier 10.192.202.5, local AS number 64696
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0 RD version: 20
BGP main routing table version 20
BGP NSR Initial initsync version 0 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
Status codes: s suppressed, d damped, h history, * valid, > best
i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> Dest:2001:db8::/0-32/56
:: 0 i
Processed 1 prefixes, 1 paths
RP/0/RSP0/CPU0:Controller#show flowspec ipv6 detail
Mon Apr 8 17:55:36.786 UTC
AFI: IPv6
Flow :Dest:2001:db8::/0-32
Actions :Traffic-rate: 0 bps (policy.1.FS_P.FLOWSPEC)
Statistics (packets/bytes)
Matched : 14/1652
Dropped : 14/1652
RP/0/RSP0/CPU0:BGL14.1.J.05-ASR-9000-1#
PE/RR1:
CRR01#show bgp ipv6 flowspec
BGP table version is 2, local router ID is 203.202.143.33
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> Dest:2001:DB8::/0-32
:: 0 64696 i
CRR01#
CRR01#show flowspec ipv6 detail
AFI: IPv6
Flow :Dest:2001:DB8::/0-32
Actions :Traffic-rate: 0 bps (bgp.1)
Statistics (packets/bytes)
Matched : 4/456
Dropped : 4/456
CRR01#
문제 해결
현재 이 컨피그레이션에 사용할 수 있는 특정 문제 해결 정보가 없습니다.
피드백