SR6608 R2604P01
SR6608 R7103P05
客户采用SR66v5和SR66v7路由器做bfd for BGP,bfd会话无法建立
1.通过debugging bfd all 分析,发现报文有收有发,但是debug有提示“Direct not match. Discard packet.”
*Nov 22 14:44:10:081 2018 H3C BFD/7/DEBUG: -Slot=2; [K]Recv:Ctrl packet, Src:10.1.255.1, Dst:10.1.255.2, Ver:1, Diag:0, Sta:2 P/F/C/A/D/M:0/0/1/0/0/0, Mult:5 LD/RD:1124/12289, Tx:400ms, Rx:400ms, EchoRx:0ms
*Nov 22 14:44:10:887 2018 H3C BFD/7/DEBUG: Direct not match. Discard packet.
*Nov 22 14:44:11:849 2018 H3C BFD/7/DEBUG: Send:Ctrl packet, Src:10.1.255.2, Dst:10.1.255.1, Ver:1, Diag:0, Sta:1 P/F/C/A/D/M:0/0/1/0/0/0, Mult:5 LD/RD:12289/0, Tx:1000ms, Rx:1000ms, EchoRx:400ms
*Nov 22 14:44:11:081 2018 H3C BFD/7/DEBUG: -Slot=2; [K]Recv:Ctrl packet, Src:10.1.255.1, Dst:10.1.255.2, Ver:1, Diag:0, Sta:2 P/F/C/A/D/M:0/0/1/0/0/0, Mult:5 LD/RD:1124/12289, Tx:400ms, Rx:400ms, EchoRx:0ms *Nov 22 14:44:11:887 2018 H3C BFD/7/DEBUG: Direct not match. Discard packet.
2.检查配置以及BFD状态,通过BFD的状态可以发现SR66-V5 Connect Type为Direct,SR66-V7 Connect Type为Indirect ,由于Connect Type不匹配,导致BFD会话无法建立。
SR6608-Release 2604P01 |
SR6608-Release 7103P05 |
bgp 65413 router-id x.x.x.x peer 10.1.255.2 route-policy set_FZ import peer 10.1.255.2 ebgp-max-hop 2 peer 10.1.255.2 timer keepalive 10 hold 30 peer 10.1.255.2 bfd # interface GigabitEthernet3/0/1 port link-mode route description 营业部_电信 combo enable fiber duplex full ip address 10.1.255.1 255.255.255.252 ip netstream inbound ip netstream outbound
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bgp 64981 router-id x.x.x.x peer 10.1.255.1 as-number 65413 peer 10.1.255.1 ebgp-max-hop 2 peer 10.1.255.1 timer keepalive 10 hold 30 peer 10.1.255.1 bfd # interface GigabitEthernet2/0/1 port link-mode route description FJ1_WN_AR03-G3/0/1 ip address 10.1.255.2 255.255.255.252 #
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Total Session Num: 9 Init Mode: Active
IPv4 Session Working Under Ctrl Mode: Local Discr: 1124 Remote Discr: 12289 Source IP: 10.1.255.1 Destination IP: 10.1.255.2 Session State: Init Interface: GigabitEthernet3/0/1 Min Trans Inter: 400ms Act Trans Inter: 1000ms Min Recv Inter: 400ms Act Detect Inter: 5000ms Running Up for: 00:00:00 Auth mode: None Connect Type: Direct Board Num: 0 Protocol: BGP Diag Info: No Diagnostic |
Total Session Num: 1 Up Session Num: 0 Init Mode: Active
IPv4 Session Working Under Ctrl Mode: Local Discr: 12289 Remote Discr: 0 Source IP: 10.1.255.2 Destination IP: 10.1.255.1 Session State: Down Interface: N/A Min Tx Inter: 400ms Act Tx Inter: 1000ms Min Rx Inter: 400ms Detect Inter: 5000ms Rx Count: 0 Tx Count: 18401 Connect Type: Indirect Running Up for: 00:00:00 Hold Time: 0ms Auth mode: None Detect Mode: Async Slot: 0 Protocol: BGP Diag Info: No Diagnostic
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3.由于V5与V7实现机制有差异,V7在直连EBGP环境中配置了peer X.X.X.X ebgp-max-hop Y命令后,BFD Connect Type变为Indirect,V5配置该命令没有影响。
方法1:V7设备配置bfd single-hop
方法2:V7设备删除ebgp-max-hop
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