为什么我的交换机无法从指定池中获取地址

2024-5-30 • tag-icon

我正在通过以下方式配置瞻博网络交换机零接触配置。在 CentOS 7 上，日志/日志/(systemd 不管是什么) 包含以下内容：

Nov 28 10:08:46 server dhcpd[8800]: Checking if packet is permitted.
Nov 28 10:08:46 server dhcpd[8800]:     Permit list: unknown clients
Nov 28 10:08:46 server dhcpd[8800]:    OK
Nov 28 10:08:46 server dhcpd[8800]: Checking if packet is permitted.
Nov 28 10:08:46 server dhcpd[8800]:     Permit list: unknown clients
Nov 28 10:08:46 server dhcpd[8800]:    OK
Nov 28 10:08:46 server dhcpd[8800]: matched a Juniper Networks QFX-5100
Nov 28 10:08:46 server dhcpd[8800]: DHCPDISCOVER from 08:b2:58:ab:dc:00 via eth2
Nov 28 10:08:47 server dhcpd[8800]: DHCPOFFER on 192.168.0.100 to 08:b2:58:ab:dc:00 (TR0217010017) via eth2
Nov 28 10:08:47 server dhcpd[8800]: Checking if packet is permitted.
Nov 28 10:08:47 server dhcpd[8800]:     Permit list: unknown clients
Nov 28 10:08:47 server dhcpd[8800]:    OK
Nov 28 10:08:47 server dhcpd[8800]: Checking if packet is permitted.
Nov 28 10:08:47 server dhcpd[8800]:     Permit list: unknown clients
Nov 28 10:08:47 server dhcpd[8800]:    OK
Nov 28 10:08:47 server dhcpd[8800]: matched a Juniper Networks QFX-5100
Nov 28 10:08:47 server dhcpd[8800]: DHCPREQUEST for 192.168.0.100 (192.168.0.250) from 08:b2:58:ab:dc:00 (TR0217010017) via eth2
Nov 28 10:08:47 server dhcpd[8800]: DHCPACK on 192.168.0.100 to 08:b2:58:ab:dc:00 (TR0217010017) via eth2

服务器是从“未知”池配置的。以下是配置的相关部分：

# Global options
max-lease-time 1800;
default-lease-time 1800;
dynamic-bootp-lease-length 120;
ddns-update-style none;

# TFTP Server IP and file
next-server 192.168.0.250; # Assumed to be the DHCP server
filename "pxelinux.0";


# Define the pxe grub filename option
option zone-pxegrub-filename code 150 = text;
option zone-pxegrub-filename "/opt/tftp_files/boot/pxelinux.0";

# Options for Juniper switch to download FW and configuration from this server
# as described here: https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/software-image-and-configuration-automatic-provisioning-confguring.html
option space NEW_OP;
option NEW_OP.config-file-name code 1 = text;
option NEW_OP.image-file-name code 0 = text;
option NEW_OP.image-file-type code 2 = text;
option NEW_OP.transfer-mode code 3 = text;
option NEW_OP.alt-image-file-name code 4 = text;
option NEW_OP-encapsulation code 43 = encapsulate NEW_OP;
option option-150 code 150 = ip-address;

# bringing in the vendor specific options
vendor-option-space NEW_OP;
option NEW_OP.image-file-name "/juniper/fw/jinstall-host-qfx-5-17.2R1.13-signed.tgz";
option NEW_OP.config-file-name "/juniper/cfg/qfx-5100.cfg";
option NEW_OP.alt-image-file-name "/juniper/fw/jinstall-host-qfx-5-17.2R1.13-signed.tgz";
option NEW_OP.image-file-type "filename";
option NEW_OP.transfer-mode "tftp";

option option-150 192.168.0.250;


class "workers" {
   match if substring(hardware, 1, 3) = 00:20:0c or substring(hardware, 1, 3) = 00:18:7D;
   log(info, "matched a worker bee");
}

class "monitor" {
   match if substring(hardware, 1, 3) = 00:d0:24;
   log(info, "matched to a monitor");
}

class "JuniperSwitch" {
   match if option vendor-class-identifier ~~ "^juniper-qfx5100.+$";
   log(info, "matched a Juniper Networks QFX-5100");
}

subnet 192.168.0.0 netmask 255.255.255.0 {
   #authoritative;
   option routers 192.168.0.250;
   pool {
      allow members of "workers";
      range 192.168.0.1 192.168.0.99;
      log(info, concat("Issuing DHCP address to worker bootp requestor: ", binary-to-ascii(16, 8, ":", substring(hardware, 1, 6))));
   }
   pool {
      allow members of "monitor";
      range 192.168.0.245;
      log(info, concat("Issuing DHCP address to monitor bootp requestor: ", binary-to-ascii(16, 8, ":", substring(hardware, 1, 6))));
   }
   pool {
      allow members of "JuniperSwitch";
      allow dynamic bootp clients;
      range 192.168.0.201;
   }
   pool {
      allow unknown-clients;
      range 192.168.0.100 192.168.0.150;
   }
}

请帮助我理解为什么这没有给出我期望的地址。

答案1

假设它是唯一通过 DHCP 请求 IP 地址的交换机，我猜测这是一个旧的/已知的 ISC DHCP 错误/“功能”：

已给出的动态租约优先于其他租约新的配置，尤其是当它们位于同一网络中时。

可以这么说，在配置特定情况之前，交换机从常规/“未知”池中获取了一个地址，并且 DHCP 守护程序会优先考虑该地址。

您可以删除 DHCP 租约文件 var/lib/dhcp/dhcpd.leases ，或者停止 DHCP 服务并从租约文件中编辑掉所有给予相关交换机 MAC 的 IP 地址租约。这样就可以达到预期的效果了新地址。

答案1

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