ACLs and HSRP, BGP, OSPF, VRRP, GLBP…

Here’s a handy list of ACL entries to allow your devices to speak routing protocols, availability protocols, and some other stuff. We’ll assume you have ACL 101 applied to your Ethernet inbound; your Ethernet has an IP of 192.168.0.1.

  • BGP : Runs on TCP/179 between the neighbors

access-list 101 permit tcp any host 192.168.0.1 eq 179

  • EIGRP : Runs on its own protocol number from the source interface IP to the multicast address of 224.0.0.10

access-list 101 permit eigrp any host 224.0.0.10

  • OSPF : Runs on its own protocol number from the source interface IP to the multicast address of 224.0.0.5; also talks to 224.0.0.6 for DR/BDR routers

access-list 101 permit ospf any host 224.0.0.5
access-list 101 permit ospf any host 224.0.0.6

  • HSRP : Runs on UDP/1985 from the source interface IP to the multicast address of 224.0.0.2. I’ve seen in the past that it runs on UDP/1985, but I didn’t find any evidence of that in a quick Google for it. Can someone verify?

access-list 101 permit udp any host 224.0.0.2 eq 1985

  • HSRP version 2 : Runs on UDP/1985 from the source interface IP to the multicast address of 224.0.0.102.

access-list 101 permit udp any host 224.0.0.2 eq 1985

  • RIP : Runs on UDP/520 from the source interface IP to the multicast address of 224.0.0.9

access-list 101 permit udp any host 224.0.0.9 eq 520

  • VRRP : Runs on its own protocol number from the source interface IP to the multicast address of 224.0.0.18

access-list 101 permit 112 any host 224.0.0.18

  • VRRP-E : This is a Foundary thing according to readers, and runs on UDP/8888 from the source interface IP to the multicast address of 224.0.0.2

access-list 101 permit 112 any host 224.0.0.2 eq 8888

  • GLBP : Runs on UDP from the source interface IP to the multicast address of 224.0.0.102

access-list 101 permit udp any host 224.0.0.102

  • DHCPD (or bootps) : Runs on UDP/67 from 0.0.0.0 (since the client doesn’t have an address yet) to 255.255.255.255 (the broadcast).

access-list 101 permit udp any host 255.255.255.255 eq 67
If anyone else has one to add, do so in the comments.

Aaron Conaway

I shake my head around sometimes and see what falls out. That's what lands on these pages. @aconaway@mstdn.social

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