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이 문서에서는 IOS®-XE SDWAN 소프트웨어를 실행하는 동일한 라우터의 서비스 측 VPN에서 DIA(Direct Internet Access) 및 DHCP 서버를 위한 중앙 집중식 데이터 정책을 구성할 때 예상되는 일반적인 문제에 대해 설명합니다.서비스 측 VPN에서 디바이스로 인그레스하고 라우터 로컬 프로세싱에 사용되는 다른 트래픽에서도 유사한 문제가 발생할 수 있습니다.
DHCP 서버는 Cisco IOS®-XE SDWAN 소프트웨어를 사용하는 라우터에서 작동하지 않습니다.DIA는 다음과 같이 중앙 데이터 정책으로 구성됩니다.
policy data-policy _LAN_DIA vpn-list LAN sequence 1 match destination-data-prefix-list EXCLUDE_SUBNET ! action accept set local-tloc-list color biz-internet lte encap ipsec ! ! ! sequence 11 action accept nat use-vpn 0 ! ! default-action accept ! lists data-prefix-list EXCLUDE_SUBNET ip-prefix 10.0.0.0/8 ! site-list DIA_BRANCHES site-id 7 site-id 6 ! vpn-list LAN vpn 10 ! ! ! apply-policy site-list DIA_BRANCHES data-policy _LAN_DIA_EXCLUDE from-service ! !
이 작업을 수행하려면 DHCP 패킷이 패킷 추적 디버그에서 브로드캐스트 주소에 대한 패킷을 라우팅할 수 없고(DROP 72 Ipv4RoutingErr) NATed(작업:SDWAN 정책(기능:SDWAN 데이터 정책 IN):
B2#show platform packet-trace summary <skipped> 28 Vl90 Vl90 DROP 72 (Ipv4RoutingErr) 29 Gi0/1/0 Gi0/0/0 FWD 30 Vl90 Vl90 DROP 72 (Ipv4RoutingErr) B2#show platform packet-trace packet 28 Packet: 28 CBUG ID: 28 Summary Input : Vlan90 Output : Vlan90 State : DROP 72 (Ipv4RoutingErr) Timestamp Start : 14482257476440 ns (12/17/2018 13:56:58.524691 UTC) Stop : 14482257534440 ns (12/17/2018 13:56:58.524749 UTC) Path Trace Feature: IPV4(Input) Input : Vlan90 Output : <unknown> Source : 0.0.0.0 Destination : 255.255.255.255 Protocol : 17 (UDP) SrcPort : 68 DstPort : 67 Feature: DEBUG_COND_INPUT_PKT Entry : Input - 0x10e44b40 Input : Vlan90 Output : <unknown> Lapsed time : 106 ns Feature: IPV4_INPUT_DST_LOOKUP_CONSUME Entry : Input - 0x10e5ca94 Input : Vlan90 Output : <unknown> Lapsed time : 253 ns Feature: IPV4_INPUT_FOR_US_MARTIAN Entry : Input - 0x10e5cb24 Input : Vlan90 Output : <unknown> Lapsed time : 4853 ns Feature: IPV4_INPUT_FNF_FIRST_EXT Entry : Input - 0x10e48968 Input : Vlan90 Output : <unknown> Lapsed time : 600 ns Feature: SDWAN Data Policy IN VRF : 1 Seq : 1 DNS Flags : (0x0) NONE Policy Flags : 0x10 Action : REDIRECT_NAT Feature: SDWAN_DATA_POLICY_IN_EXT Entry : Input - 0x10eb9d7c Input : Vlan90 Output : <unknown> Lapsed time : 5360 ns Feature: IPV4_INPUT_DST_LOOKUP_ISSUE Entry : Input - 0x10e5c9d8 Input : Vlan90 Output : <unknown> Lapsed time : 200 ns Feature: IPV4_INPUT_ARL Entry : Input - 0x10e46158 Input : Vlan90 Output : <unknown> Lapsed time : 200 ns Feature: IPV4_INTERNAL_DST_LOOKUP_CONSUME Entry : Input - 0x10e5cac4 Input : Vlan90 Output : <unknown> Lapsed time : 253 ns Feature: STILE_LEGACY_DROP Entry : Input - 0x10eb294c Input : Vlan90 Output : <unknown> Lapsed time : 306 ns Feature: INGRESS_MMA_LOOKUP_DROP Entry : Input - 0x10eae2a4 Input : Vlan90 Output : <unknown> Lapsed time : 213 ns Feature: INPUT_DROP_FNF_AOR Entry : Input - 0x10e5b864 Input : Vlan90 Output : <unknown> Lapsed time : 386 ns Feature: INPUT_FNF_DROP Entry : Input - 0x10e48cf8 Input : Vlan90 Output : <unknown> Lapsed time : 493 ns Feature: INPUT_DROP_FNF_AOR_RELEASE Entry : Input - 0x10e5b234 Input : Vlan90 Output : <unknown> Lapsed time : 213 ns Feature: INPUT_DROP Entry : Input - 0x10e439d4 Input : Vlan90 Output : <unknown> Lapsed time : 106 ns Feature: IPV4_INTERNAL_FOR_US Entry : Input - 0x10e5cb54 Input : Vlan90 Output : <unknown> Lapsed time : 4640 ns
다음과 같이 NAT에서 DHCP 패킷(UDP 포트 67,68)을 제외하도록 데이터 정책이 수정됩니다.
B2# show sdwan policy from-vsmart from-vsmart data-policy _LAN_DIA direction from-service vpn-list LAN sequence 1 match destination-data-prefix-list EXCLUDE_SUBNET action accept set local-tloc-list color biz-internet lte encap ipsec sequence 11 match destination-port 67-68 protocol 17 action accept sequence 21 match source-port 67-68 protocol 17 action accept sequence 31 action accept nat use-vpn 0 no nat fallback default-action accept from-vsmart lists vpn-list LAN vpn 10 from-vsmart lists data-prefix-list EXCLUDE_SUBNET ip-prefix 10.0.0.0/8
packet-trace debug는 DHCP 패킷에 대해 다른 그림을 표시하며 추가 로컬 처리를 위해 RP CPU에 펀딩됩니다(상태:PUNT 60)는 다음과 같은 조건을 갖춰야 합니다.
B2#show platform packet-trace summary Pkt Input Output State Reason <skipped> 88 Vl90 internal0/0/rp:0 PUNT 60 (IP subnet or broadcast pac 89 INJ.7 Gi0/1/0.MOD0 FWD 90 Gi0/1/0 internal0/0/rp:0 PUNT 60 (IP subnet or broadcast pac 91 INJ.7 Gi0/1/0.MOD0 FWD 92 Gi0/0/0 internal0/0/rp:0 PUNT 60 (IP subnet or broadcast pac 93 Gi0/1/1 Ce0/2/0 FWD 94 Gi0/0/0 internal0/0/rp:0 PUNT 60 (IP subnet or broadcast pac 95 Vl90 internal0/0/rp:0 PUNT 60 (IP subnet or broadcast pac 96 INJ.7 Gi0/1/0.MOD0 FWD 97 Gi0/1/1 internal0/0/rp:0 PUNT 60 (IP subnet or broadcast pac 98 INJ.7 Gi0/1/0.MOD0 FWD B2# show platform packet-trace packet 88 Packet: 88 CBUG ID: 88 Summary Input : Vlan90 Output : internal0/0/rp:0 State : PUNT 60 (IP subnet or broadcast pac Timestamp Start : 16485953871600 ns (12/17/2018 14:30:22.221086 UTC) Stop : 16485953959680 ns (12/17/2018 14:30:22.221174 UTC) Path Trace Feature: IPV4(Input) Input : Vlan90 Output : <unknown> Source : 0.0.0.0 Destination : 255.255.255.255 Protocol : 17 (UDP) SrcPort : 68 DstPort : 67 Feature: DEBUG_COND_INPUT_PKT Entry : Input - 0x10e44b40 Input : Vlan90 Output : <unknown> Lapsed time : 93 ns Feature: IPV4_INPUT_DST_LOOKUP_CONSUME Entry : Input - 0x10e5ca94 Input : Vlan90 Output : <unknown> Lapsed time : 320 ns Feature: IPV4_INPUT_FOR_US_MARTIAN Entry : Input - 0x10e5cb24 Input : Vlan90 Output : <unknown> Lapsed time : 8053 ns Feature: IPV4_INPUT_FNF_FIRST_EXT Entry : Input - 0x10e48968 Input : Vlan90 Output : <unknown> Lapsed time : 533 ns Feature: SDWAN Data Policy IN VRF : 1 Seq : 1 DNS Flags : (0x0) NONE Policy Flags : 0x0 Action : NONE Feature: SDWAN_DATA_POLICY_IN_EXT Entry : Input - 0x10eb9d7c Input : Vlan90 Output : <unknown> Lapsed time : 5626 ns Feature: IPV4_INPUT_LOOKUP_PROCESS_EXT Entry : Input - 0x10e5cc70 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 1600 ns Feature: IPV4_INPUT_FNF_FINAL_EXT Entry : Input - 0x10e489c8 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 386 ns Feature: IPV4_INPUT_IPOPTIONS_PROCESS_EXT Entry : Input - 0x10e5ce10 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 186 ns Feature: IPV4_INPUT_GOTO_OUTPUT_FEATURE_EXT Entry : Input - 0x10e46278 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 493 ns Feature: CBUG_OUTPUT_FIA_EXT Entry : Output - 0x10e44c00 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 560 ns Feature: IPV4_INTERNAL_ARL_SANITY_EXT Entry : Output - 0x10e46128 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 253 ns Feature: IPV4_OUTPUT_THREAT_DEFENSE_EXT Entry : Output - 0x10eb5cc4 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 266 ns Feature: IPV4_VFR_REFRAG_EXT Entry : Output - 0x10e5cf10 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 66 ns Feature: IPV4_OUTPUT_DROP_POLICY_EXT Entry : Output - 0x10e5e900 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 2586 ns Feature: DEBUG_COND_OUTPUT_PKT_EXT Entry : Output - 0x10e44ba0 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 133 ns Feature: INTERNAL_TRANSMIT_PKT_EXT Entry : Output - 0x10e45420 Input : Vlan90 Output : internal0/0/rp:0 Lapsed time : 5066 ns IOSd Path Flow: Packet: 88 CBUG ID: 88 Feature: INFRA Pkt Direction: IN Packet Rcvd From DATAPLANE Feature: IP Pkt Direction: IN Source : 0.0.0.0 Destination : 255.255.255.255 Feature: IP Pkt Direction: IN Packet Enqueued in IP layer Source : 0.0.0.0 Destination : 255.255.255.255 Interface : Vlan90 Feature: UDP Pkt Direction: IN src : 0.0.0.0(68) dst : 255.255.255.255(67) length : 308
이는 예상되는 동작이며, 중앙 집중식 데이터 정책에서 특정 트래픽 유형을 적절하게 제외하지 않는 경우, RP(Local Device Route Processor) CPU 처리(예: 라우터가 NTP 소스로 작동하는 경우 NTP(Network Time Protocol) 동기화)를 위해 의도된 다른 트래픽에서 유사한 문제가 발견될 수 있습니다.
참고:데이터 경로 패킷 추적에 대한 자세한 내용은 다음을 참조하십시오. https://www.cisco.com/c/en/us/support/docs/content-networking/adaptive-session-redundancy-asr/117858-technote-asr-00.html