Changes for page BGP

Last modified by Jean Franco on 2022/06/23 22:09
From version 1.1 >
edited by Jean Franco
on 2022/06/20 23:32
To version < 2.2
edited by Jean Franco
on 2022/06/23 22:09
Change comment: Update document after refactoring.

Summary

Details

Page properties
Parent
... ... @@ -1,1 +1,1 @@
1 -Ubiquiti.WebHome
1 +Main.Hardware.Ubiquiti.WebHome
Content
... ... @@ -33,3 +33,202 @@
33 33   }
34 34  }
35 35  {{/code}}
36 +
37 +The -From prefix lists are for routes you receive (imported) from your ISP, while the -To lists are for routes being exported (announced) to your provider. In the case of IPv4, the smallest globally accepted size most if not all providers announce is /24. For IPv6, the smallest globally accepted size is /48.
38 +
39 +'le' means any prefix smaller (ie: 'le 48' won't allow a /64 IPv6 prefix from your ISP's routing table, but it will allow a /32). 'ge' means any prefix greater (ie: 'ge 56' won't allow a /48, but will allow a /56, /64, or even /128).
40 +
41 +In the above examples, 192.0.2.0/24 is your IPv4 netblock, and 2001:DB8::/32 is your IPv6 one. 0.0.0.0/0 and 0::/0 means match all.
42 +
43 +=== Route Maps ===
44 +
45 +While you can just use prefix lists with BGP to control routes imported and exported, route maps give you much more flexibility and control, and can even include AS path matching.
46 +
47 +{{code language="none"}}
48 +policy {
49 + route-map BGP-ISPv6-From {
50 + rule 10 {
51 + action permit
52 + match {
53 + ipv6 {
54 + address {
55 + prefix-list BGP-ISPv6-From
56 + }
57 + }
58 + }
59 + }
60 + }
61 + route-map BGP-ISPv6-To {
62 + rule 10 {
63 + action permit
64 + match {
65 + ipv6 {
66 + address {
67 + prefix-list BGP-ISPv6-To
68 + }
69 + }
70 + }
71 + }
72 + }
73 + route-map BGP-ISP-From {
74 + rule 10 {
75 + action permit
76 + match {
77 + ip {
78 + address {
79 + prefix-list BGP-ISP-From
80 + }
81 + }
82 + }
83 + }
84 + }
85 + route-map BGP-ISP-To {
86 + rule 10 {
87 + action permit
88 + match {
89 + ip {
90 + address {
91 + prefix-list BGP-ISP-To
92 + }
93 + }
94 + }
95 + }
96 + }
97 +}
98 +{{/code}}
99 +
100 +Like the prefix lists, -To and -From are your specific directions in and out (import and export). They're pretty self explanatory and reference the prefix lists used before.
101 +
102 +BGP Protocol Information
103 +
104 +{{code language="none"}}
105 +protocols {
106 + bgp 65501 {
107 + address-family {
108 + ipv6-unicast {
109 + network 2001:DB8::/32 {
110 + }
111 + }
112 + }
113 + neighbor 100.64.100.1 {
114 + remote-as 65502
115 + route-map {
116 + export BGP-ISP-To
117 + import BGP-ISP-From
118 + }
119 + soft-reconfiguration {
120 + inbound
121 + }
122 + update-source 100.64.100.2
123 + }
124 + neighbor fd00::1 {
125 + address-family {
126 + ipv6-unicast {
127 + route-map {
128 + export BGP-ISPv6-To
129 + import BGP-ISPv6-From
130 + }
131 + }
132 + }
133 + remote-as 65502
134 + soft-reconfiguration {
135 + inbound
136 + }
137 + update-source fd00::2
138 + }
139 + network 192.0.2.0/24 {
140 + }
141 + parameters {
142 + router-id 100.64.100.2
143 + }
144 + redistribute {
145 + connected {
146 + }
147 + kernel {
148 + }
149 + static {
150 + }
151 + }
152 + }
153 +}
154 +{{/code}}
155 +
156 +In the above example, our local router has the IPv4 address of 100.64.100.2 and the IPv6 address of fd00::2 with an ASN of 65501. The BGP enabled router on our ISP side is 100.64.100.1 and fd00::1 with an ASN of 65502. We are assuming that our routers are connected over a non-shared link within one hop. If the BGP router is more than one hop away, you need to configure 'ebgp-multihop' with the appropriate amount of hops away your ISP's router is.
157 +
158 +Show BGP information:
159 +
160 +{{code language="none"}}
161 +user@router1:~$ show ip bgp neighbor
162 +BGP neighbor is 100.64.100.2, remote AS 65502, local AS 65501, external link
163 + BGP version 4, remote router ID 100.64.100.2
164 + BGP state = Established, up for 01w0d05h
165 + Last read 01w0d05h, hold time is 90, keepalive interval is 30 seconds
166 + Neighbor capabilities:
167 + Route refresh: advertised and received (old and new)
168 + 4-Octet ASN Capability: advertised and received
169 + Address family IPv4 Unicast: advertised and received
170 + Address family IPv4 Multicast: received
171 + Received 2838376 messages, 0 notifications, 0 in queue
172 + Sent 20788 messages, 0 notifications, 0 in queue
173 + Route refresh request: received 0, sent 0
174 + Minimum time between advertisement runs is 30 seconds
175 + Update source is 100.64.100.1
176 + For address family: IPv4 Unicast
177 + BGP table version 6603726, neighbor version 6603716
178 + Index 2, Offset 0, Mask 0x4
179 + Inbound soft reconfiguration allowed
180 + Community attribute sent to this neighbor (both)
181 + Inbound path policy configured
182 + Outbound path policy configured
183 + Route map for incoming advertisements is *BGP-ISP-From
184 + Route map for outgoing advertisements is *BGP-ISP-To
185 + 688930 accepted prefixes
186 + 1 announced prefixes
187 +
188 + Connections established 1; dropped 0
189 + External BGP neighbor may be up to 1 hops away.
190 +Local host: 100.64.100.2, Local port: 60803
191 +Foreign host: 100.64.100.1, Foreign port: 179
192 +Nexthop: 100.64.100.1
193 +BGP connection: shared network
194 +
195 +BGP neighbor is fd00::1, remote AS 65502, local AS 65501, external link
196 + BGP version 4, remote router ID 100.64.100.1
197 + BGP state = Established, up for 01w0d05h
198 + Last read 01w0d05h, hold time is 180, keepalive interval is 60 seconds
199 + Neighbor capabilities:
200 + Route refresh: advertised and received (old and new)
201 + 4-Octet ASN Capability: advertised and received
202 + Address family IPv4 Unicast: advertised
203 + Address family IPv6 Unicast: advertised and received
204 + Received 686685 messages, 0 notifications, 0 in queue
205 + Sent 10394 messages, 0 notifications, 0 in queue
206 + Route refresh request: received 0, sent 0
207 + Minimum time between advertisement runs is 30 seconds
208 + Update source is fd00::2
209 + For address family: IPv4 Unicast
210 + BGP table version 6603726, neighbor version 6603716
211 + Index 1, Offset 0, Mask 0x2
212 + Inbound soft reconfiguration allowed
213 + Community attribute sent to this neighbor (both)
214 + 0 accepted prefixes
215 + 0 announced prefixes
216 +
217 + For address family: IPv6 Unicast
218 + BGP table version 858622, neighbor version 858620
219 + Index 1, Offset 0, Mask 0x2
220 + Community attribute sent to this neighbor (both)
221 + Inbound path policy configured
222 + Outbound path policy configured
223 + Route map for incoming advertisements is *BGP-ISPv6-From
224 + Route map for outgoing advertisements is *BGP-ISPv6-To
225 + 49892 accepted prefixes
226 + 1 announced prefixes
227 +
228 + Connections established 1; dropped 0
229 +Local host: fd00::2, Local port: 179
230 +Foreign host: fd00::1, Foreign port: 8044
231 +Nexthop: 100.64.100.1
232 +Nexthop global: fd00::1
233 +BGP connection: shared network
234 +{{/code}}
Maila Networks