Last modified by Jean Franco on 2024/06/09 20:48
Show last authors
1 [[//In the example diagram above, an eBGP neighborship is set up between ER-L (**AS 64512**) and ER-R (**AS 65000**) which allows the neighbors to exchange routing information. In this case, ER-L will advertise the 198.51.100.x/26 networks to ER-R. //>>image:1-topology.png]]
2
3 Follow the steps below to configure the BGP protocol on both routers:
4
5 **CLI:** Access the Command Line Interface on ER-L.You can do this using the CLI button in the GUI or by using a program such as PuTTY.
6
7 ~1. Enter configuration mode.
8
9 {{{configure}}}
10
11 2. Define the BGP Autonomous System (AS) number and the Router ID.
12
13 Copy
14
15 {{{set protocols bgp 64512 parameters router-id 203.0.113.1}}}
16
17 3. Define the IP address and AS number used by the BGP neighbor.
18
19 Copy
20
21 {{{set protocols bgp 64512 neighbor 192.0.2.1 remote-as 65000}}}
22
23 4. As the neighbors are not directly connected, enable **ebgp-multihop** and additional options such as **soft-reconfiguration**.
24
25 Copy
26
27 {{{set protocols bgp 64512 neighbor 192.0.2.1 ebgp-multihop 255
28 set protocols bgp 64512 neighbor 192.0.2.1 soft-reconfiguration inbound}}}
29
30 **NOTE:**The value set in the **ebgp-multihop...** command can be customized.
31
32 5. Create **blackhole** routes for the 198.51.100.x/26 networks that should be advertised into BGP.
33
34 Copy
35
36 {{{set protocols static route 198.51.100.0/26 blackhole
37 set protocols static route 198.51.100.64/26 blackhole
38 set protocols static route 198.51.100.128/26 blackhole
39 set protocols static route 198.51.100.192/26 blackhole}}}
40
41 6. Advertise the 198.51.100.x/26 routes into BGP by using the **network** statement.
42
43 Copy
44
45 {{{set protocols bgp 64512 network 198.51.100.0/26
46 set protocols bgp 64512 network 198.51.100.64/26
47 set protocols bgp 64512 network 198.51.100.128/26
48 set protocols bgp 64512 network 198.51.100.192/26}}}
49
50 **NOTE:**The **network...** statements in BGP must match the routes present in the routing table.
51
52 7. Commit the changes and save the configuration.
53
54 {{{commit ; save}}}
55
56 **CLI:** Access the Command Line Interface on ER-R.You can do this using the CLI button in the GUI or by using a program such as PuTTY.
57
58 ~1. Enter configuration mode.
59
60 {{{configure}}}
61
62 2. Define the BGP Autonomous System (AS) number and the Router ID.
63
64 Copy
65
66 {{{set protocols bgp 65000 parameters router-id 192.0.2.1}}}
67
68 3. Define the IP address and AS number used by the BGP neighbor.
69
70 Copy
71
72 {{{set protocols bgp 65000 neighbor 203.0.113.1 remote-as 64512}}}
73
74 4. As the neighbors are not directly connected, enable **ebgp-multihop** and additional options such as **soft-reconfiguration**.
75
76 Copy
77
78 {{{set protocols bgp 65000 neighbor 203.0.113.1 ebgp-multihop 255
79 set protocols bgp 65000 neighbor 203.0.113.1 soft-reconfiguration inbound}}}
80
81 **NOTE:**The value set in the **ebgp-multihop...** command can be customized.
82
83 5. Commit the changes and save the configuration.
84
85 {{{commit ; save}}}
86
87 The BGP neighborship and advertised/received routes can be verified with the following commands:
88
89 {{{show ip bgp summary
90 show ip bgp
91 show ip bgp neighbors 192.0.2.1 advertised-routes
92 show ip bgp neighbors 192.0.2.1 received-routes}}}
93
94
95 == Additional BGP Options ==
96
97 There are many other BGP options and additional features that can be configured when using BGP. Some of the more popular options are:
98
99 * Route-Maps
100 * Prefix-Lists
101 * BGP Communities
102 * Peer Groups
103 * Route Reflectors
104 * Confederations
105
106 See the output below for a list of available commands (output may differ between firmware versions):
107
108 {{{set protocols bgp 64512 ?
109 Possible completions:
110 address-family BGP address-family parameters
111 aggregate-address BGP aggregate network
112 dampening Enable route-flap dampening
113 maximum-paths BGP multipaths
114 neighbor BGP neighbor
115 network BGP network
116 parameters BGP parameters
117 peer-group BGP peer-group
118 redistribute Redistribute routes from other protocols into BGP
119 timers BGP protocol timers
120
121 set protocols bgp 64512 parameters ?
122 Possible completions:
123 always-compare-med Always compare MEDs from different neighbors
124 bestpath Default bestpath selection mechanism
125 cluster-id Route-reflector cluster-id
126 confederation AS confederation parameters
127 dampening Enable route-flap dampening
128 default BGP defaults
129 deterministic-med Compare MEDs between different peers in the same AS
130 distance Administratives distances for BGP routes
131 enforce-first-as Require first AS in the path to match peer's AS
132 graceful-restart Graceful restart capability parameters
133 log-neighbor-changes Log neighbor up/down changes and reset reason
134 no-client-to-client-reflection Disable client to client route reflection
135 no-fast-external-failover Disable immediate sesison reset if peer's connected link goes down
136 router-id BGP router id
137 scan-time BGP route scanner interval
138
139 set protocols bgp 64512 neighbor 192.0.2.1 ?
140 Possible completions:
141 address-family Parameters relating to IPv4 or IPv6 routes
142 advertisement-interval Minimum interval for sending routing updates
143 allowas-in Accept a route that contains the local-AS in the as-path
144 attribute-unchanged BGP attributes are sent unchanged
145 capability Advertise capabilities to this neighbor
146 default-originate Send default route to this neighbor
147 description Description for this neighbor
148 disable-capability-negotiation Disable capability negotiation with this neighbor
149 disable-send-community Disable sending community attributes to this neighbor
150 distribute-list Access-list to filter route updates to/from this neighbor
151 ebgp-multihop Allow this EBGP neighbor to not be on a directly connected network
152 fall-over Fall-over detection
153 filter-list As-path-list to filter route updates to/from this neighbor
154 local-as Local AS number
155 maximum-prefix Maximum number of prefixes to accept from this neighbor
156 nexthop-self Nexthop for routes sent to this neighbor to be the local router
157 no-activate Disable the Address Family for this Neighbor
158 override-capability Ignore capability negotiation with specified neighbor
159 passive Do not initiate a session with this neighbor
160 password BGP MD5 password
161 peer-group IPv4 peer group for this peer
162 port Neighbor's BGP port
163 prefix-list Prefix-list to filter route updates to/from this neighbor
164 remote-as Neighbor BGP AS number [REQUIRED]
165 remove-private-as Remove private AS numbers from AS path in outbound route updates
166 route-map Route-map to filter route updates to/from this neighbor
167 route-reflector-client Neighbor as a route reflector client
168 route-server-client Neighbor is route server client
169 shutdown Administratively shut down neighbor
170 soft-reconfiguration Soft reconfiguration for neighbor
171 strict-capability-match Enable strict capability negotiation
172 timers Neighbor timers
173 unsuppress-map Route-map to selectively unsuppress suppressed routes
174 update-source Source IP of routing updates
175 weight Default weight for routes from this neighbor}}}
Maila Networks