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0efdf0fe | 1 | .. _route-map: |
42fc5d26 | 2 | |
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3 | ********** |
4 | Route Maps | |
5 | ********** | |
42fc5d26 | 6 | |
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7 | Route maps provide a means to both filter and/or apply actions to route, hence |
8 | allowing policy to be applied to routes. | |
42fc5d26 | 9 | |
655cdc32 | 10 | Route maps are an ordered list of route map entries. Each entry may specify up |
d1e7591e | 11 | to four distinct sets of clauses: |
42fc5d26 | 12 | |
013f9762 | 13 | .. glossary:: |
42fc5d26 | 14 | |
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15 | Matching Conditions |
16 | A route-map entry may, optionally, specify one or more conditions which | |
17 | must be matched if the entry is to be considered further, as governed by | |
d1e7591e | 18 | the Match Policy. If a route-map entry does not explicitly specify any |
013f9762 | 19 | matching conditions, then it always matches. |
42fc5d26 | 20 | |
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21 | Set Actions |
22 | A route-map entry may, optionally, specify one or more Set Actions to set | |
23 | or modify attributes of the route. | |
42fc5d26 | 24 | |
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25 | Matching Policy |
26 | This specifies the policy implied if the :term:`Matching Conditions` are | |
27 | met or not met, and which actions of the route-map are to be taken, if | |
28 | any. The two possibilities are: | |
42fc5d26 | 29 | |
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30 | - :dfn:`permit`: If the entry matches, then carry out the |
31 | :term:`Set Actions`. Then finish processing the route-map, permitting | |
32 | the route, unless an :term:`Exit Policy` action indicates otherwise. | |
42fc5d26 | 33 | |
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34 | - :dfn:`deny`: If the entry matches, then finish processing the route-map and |
35 | deny the route (return `deny`). | |
42fc5d26 | 36 | |
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37 | The `Matching Policy` is specified as part of the command which defines |
38 | the ordered entry in the route-map. See below. | |
42fc5d26 | 39 | |
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40 | Call Action |
41 | Call to another route-map, after any :term:`Set Actions` have been carried out. | |
42 | If the route-map called returns `deny` then processing of the route-map | |
43 | finishes and the route is denied, regardless of the :term:Matching Policy` or | |
44 | the :term:`Exit Policy`. If the called route-map returns `permit`, then | |
45 | :term:`Matching Policy` and :term:`Exit Policy` govern further behaviour, as normal. | |
42fc5d26 | 46 | |
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47 | Exit Policy |
48 | An entry may, optionally, specify an alternative :dfn:`Exit Policy` to | |
49 | take if the entry matched, rather than the normal policy of exiting the | |
50 | route-map and permitting the route. The two possibilities are: | |
42fc5d26 | 51 | |
013f9762 | 52 | - :dfn:`next`: Continue on with processing of the route-map entries. |
42fc5d26 | 53 | |
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54 | - :dfn:`goto N`: Jump ahead to the first route-map entry whose order in |
55 | the route-map is >= N. Jumping to a previous entry is not permitted. | |
42fc5d26 | 56 | |
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57 | The default action of a route-map, if no entries match, is to deny. I.e. a |
58 | route-map essentially has as its last entry an empty *deny* entry, which | |
59 | matches all routes. To change this behaviour, one must specify an empty | |
60 | *permit* entry as the last entry in the route-map. | |
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61 | |
62 | To summarise the above: | |
63 | ||
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64 | +--------+--------+----------+ |
65 | | | Match | No Match | | |
66 | +========+========+==========+ | |
67 | | Permit | action | cont | | |
68 | +--------+--------+----------+ | |
69 | | Deny | deny | cont | | |
70 | +--------+--------+----------+ | |
71 | ||
72 | action | |
73 | - Apply *set* statements | |
74 | - If *call* is present, call given route-map. If that returns a ``deny``, | |
75 | finish processing and return ``deny``. | |
76 | - If *Exit Policy* is *next*, goto next route-map entry | |
77 | - If *Exit Policy* is *goto*, goto first entry whose order in the | |
78 | list is >= the given order. | |
79 | - Finish processing the route-map and permit the route. | |
80 | ||
81 | deny | |
82 | The route is denied by the route-map (return ``deny``). | |
83 | ||
84 | cont | |
85 | goto next route-map entry | |
42fc5d26 | 86 | |
0efdf0fe | 87 | .. _route-map-command: |
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88 | |
89 | Route Map Command | |
90 | ================= | |
91 | ||
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92 | .. index:: route-map ROUTE-MAP-NAME (permit|deny) ORDER |
93 | .. clicmd:: route-map ROUTE-MAP-NAME (permit|deny) ORDER | |
42fc5d26 | 94 | |
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95 | Configure the `order`'th entry in `route-map-name` with ``Match Policy`` of |
96 | either *permit* or *deny*. | |
42fc5d26 | 97 | |
0efdf0fe | 98 | .. _route-map-match-command: |
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99 | |
100 | Route Map Match Command | |
101 | ======================= | |
102 | ||
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103 | .. index:: match ip address ACCESS_LIST |
104 | .. clicmd:: match ip address ACCESS_LIST | |
42fc5d26 | 105 | |
655cdc32 | 106 | Matches the specified `access_list` |
42fc5d26 | 107 | |
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108 | .. index:: match ip address PREFIX-LIST |
109 | .. clicmd:: match ip address PREFIX-LIST | |
42fc5d26 | 110 | |
655cdc32 | 111 | Matches the specified `prefix-list` |
42fc5d26 | 112 | |
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113 | .. index:: match ip address prefix-len 0-32 |
114 | .. clicmd:: match ip address prefix-len 0-32 | |
42fc5d26 | 115 | |
655cdc32 | 116 | Matches the specified `prefix-len`. This is a Zebra specific command. |
42fc5d26 | 117 | |
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118 | .. index:: match ipv6 address ACCESS_LIST |
119 | .. clicmd:: match ipv6 address ACCESS_LIST | |
42fc5d26 | 120 | |
655cdc32 | 121 | Matches the specified `access_list` |
42fc5d26 | 122 | |
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123 | .. index:: match ipv6 address PREFIX-LIST |
124 | .. clicmd:: match ipv6 address PREFIX-LIST | |
42fc5d26 | 125 | |
655cdc32 | 126 | Matches the specified `prefix-list` |
42fc5d26 | 127 | |
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128 | .. index:: match ipv6 address prefix-len 0-128 |
129 | .. clicmd:: match ipv6 address prefix-len 0-128 | |
42fc5d26 | 130 | |
655cdc32 | 131 | Matches the specified `prefix-len`. This is a Zebra specific command. |
42fc5d26 | 132 | |
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133 | .. index:: match ip next-hop IPV4_ADDR |
134 | .. clicmd:: match ip next-hop IPV4_ADDR | |
42fc5d26 | 135 | |
655cdc32 | 136 | Matches the specified `ipv4_addr`. |
42fc5d26 | 137 | |
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138 | .. index:: match aspath AS_PATH |
139 | .. clicmd:: match aspath AS_PATH | |
42fc5d26 | 140 | |
655cdc32 | 141 | Matches the specified `as_path`. |
42fc5d26 | 142 | |
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143 | .. index:: match metric METRIC |
144 | .. clicmd:: match metric METRIC | |
42fc5d26 | 145 | |
655cdc32 | 146 | Matches the specified `metric`. |
42fc5d26 | 147 | |
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148 | .. index:: match tag TAG |
149 | .. clicmd:: match tag TAG | |
150 | ||
151 | Matches the specified tag value associated with the route. This tag value | |
152 | can be in the range of (1-4294967295). | |
153 | ||
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154 | .. index:: match local-preference METRIC |
155 | .. clicmd:: match local-preference METRIC | |
42fc5d26 | 156 | |
655cdc32 | 157 | Matches the specified `local-preference`. |
42fc5d26 | 158 | |
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159 | .. index:: match community COMMUNITY_LIST |
160 | .. clicmd:: match community COMMUNITY_LIST | |
42fc5d26 | 161 | |
655cdc32 | 162 | Matches the specified `community_list` |
42fc5d26 | 163 | |
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164 | .. index:: match peer IPV4_ADDR |
165 | .. clicmd:: match peer IPV4_ADDR | |
42fc5d26 | 166 | |
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167 | This is a BGP specific match command. Matches the peer ip address |
168 | if the neighbor was specified in this manner. | |
42fc5d26 | 169 | |
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170 | .. index:: match peer IPV6_ADDR |
171 | .. clicmd:: match peer IPV6_ADDR | |
42fc5d26 | 172 | |
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173 | This is a BGP specific match command. Matches the peer ipv6 |
174 | address if the neighbor was specified in this manner. | |
42fc5d26 | 175 | |
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176 | .. index:: match peer INTERFACE_NAME |
177 | .. clicmd:: match peer INTERFACE_NAME | |
42fc5d26 | 178 | |
655cdc32 | 179 | This is a BGP specific match command. Matches the peer |
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180 | interface name specified if the neighbor was specified |
181 | in this manner. | |
182 | ||
0efdf0fe | 183 | .. _route-map-set-command: |
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184 | |
185 | Route Map Set Command | |
186 | ===================== | |
187 | ||
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188 | .. program:: configure |
189 | ||
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190 | .. index:: set tag TAG |
191 | .. clicmd:: set tag TAG | |
192 | ||
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193 | Set a tag on the matched route. This tag value can be from (1-4294967295). |
194 | Additionally if you have compiled with the :option:`--enable-realms` | |
195 | configure option. Tag values from (1-255) are sent to the Linux kernel as a | |
196 | realm value. Then route policy can be applied. See the tc man page. | |
197 | ||
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198 | .. index:: set ip next-hop IPV4_ADDRESS |
199 | .. clicmd:: set ip next-hop IPV4_ADDRESS | |
42fc5d26 | 200 | |
e13fd66f DS |
201 | Set the BGP nexthop address to the specified IPV4_ADDRESS. For both |
202 | incoming and outgoing route-maps. | |
203 | ||
204 | .. index:: set ip next-hop peer-address | |
205 | .. clicmd:: set ip next-hop peer-address | |
206 | ||
207 | Set the BGP nexthop address to the address of the peer. For an incoming | |
208 | route-map this means the ip address of our peer is used. For an outgoing | |
209 | route-map this means the ip address of our self is used to establish the | |
210 | peering with our neighbor. | |
211 | ||
212 | .. index:: set ip next-hop unchanged | |
213 | .. clicmd:: set ip next-hop unchanged | |
214 | ||
215 | Set the route-map as unchanged. Pass the route-map through without | |
216 | changing it's value. | |
217 | ||
218 | .. index:: set ipv6 next-hop peer-address | |
219 | .. clicmd:: set ipv6 next-hop peer-address | |
220 | ||
221 | Set the BGP nexthop address to the address of the peer. For an incoming | |
222 | route-map this means the ipv6 address of our peer is used. For an outgoing | |
223 | route-map this means the ip address of our self is used to establish the | |
224 | peering with our neighbor. | |
225 | ||
226 | .. index:: set ipv6 next-hop prefer-global | |
227 | .. clicmd:: set ipv6 next-hop prefer-global | |
228 | ||
229 | For Incoming and Import Route-maps if we receive a v6 global and v6 LL | |
230 | address for the route, then prefer to use the global address as the nexthop. | |
231 | ||
232 | .. index:: set ipv6 next-hop global IPV6_ADDRESS | |
233 | .. clicmd:: set ipv6 next-hop global IPV6_ADDRESS | |
234 | ||
f22744c3 | 235 | Set the next-hop to the specified IPV6_ADDRESS for both incoming and |
e13fd66f | 236 | outgoing route-maps. |
42fc5d26 | 237 | |
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238 | .. index:: set local-preference LOCAL_PREF |
239 | .. clicmd:: set local-preference LOCAL_PREF | |
42fc5d26 | 240 | |
655cdc32 | 241 | Set the BGP local preference to `local_pref`. |
42fc5d26 | 242 | |
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243 | .. index:: set weight WEIGHT |
244 | .. clicmd:: set weight WEIGHT | |
42fc5d26 | 245 | |
655cdc32 | 246 | Set the route's weight. |
42fc5d26 | 247 | |
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248 | .. index:: set metric METRIC |
249 | .. clicmd:: set metric METRIC | |
42fc5d26 | 250 | |
655cdc32 | 251 | Set the BGP attribute MED. |
42fc5d26 | 252 | |
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253 | .. index:: set as-path prepend AS_PATH |
254 | .. clicmd:: set as-path prepend AS_PATH | |
42fc5d26 | 255 | |
655cdc32 | 256 | Set the BGP AS path to prepend. |
42fc5d26 | 257 | |
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258 | .. index:: set community COMMUNITY |
259 | .. clicmd:: set community COMMUNITY | |
42fc5d26 | 260 | |
655cdc32 | 261 | Set the BGP community attribute. |
42fc5d26 | 262 | |
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263 | .. index:: set ipv6 next-hop local IPV6_ADDRESS |
264 | .. clicmd:: set ipv6 next-hop local IPV6_ADDRESS | |
42fc5d26 | 265 | |
655cdc32 | 266 | Set the BGP-4+ link local IPv6 nexthop address. |
42fc5d26 | 267 | |
0efdf0fe | 268 | .. _route-map-call-command: |
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269 | |
270 | Route Map Call Command | |
271 | ====================== | |
272 | ||
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273 | .. index:: call NAME |
274 | .. clicmd:: call NAME | |
42fc5d26 | 275 | |
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276 | Call route-map `name`. If it returns deny, deny the route and |
277 | finish processing the route-map. | |
42fc5d26 | 278 | |
0efdf0fe | 279 | .. _route-map-exit-action-command: |
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280 | |
281 | Route Map Exit Action Command | |
282 | ============================= | |
283 | ||
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284 | .. index:: on-match next |
285 | .. clicmd:: on-match next | |
42fc5d26 | 286 | |
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287 | .. index:: continue |
288 | .. clicmd:: continue | |
42fc5d26 | 289 | |
655cdc32 | 290 | Proceed on to the next entry in the route-map. |
42fc5d26 | 291 | |
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292 | .. index:: on-match goto N |
293 | .. clicmd:: on-match goto N | |
42fc5d26 | 294 | |
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295 | .. index:: continue N |
296 | .. clicmd:: continue N | |
42fc5d26 | 297 | |
655cdc32 | 298 | Proceed processing the route-map at the first entry whose order is >= N |
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299 | |
300 | Route Map Examples | |
301 | ================== | |
302 | ||
303 | A simple example of a route-map: | |
304 | ||
9eb95b3b | 305 | .. code-block:: frr |
42fc5d26 | 306 | |
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307 | route-map test permit 10 |
308 | match ip address 10 | |
309 | set local-preference 200 | |
a8c90e15 | 310 | |
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311 | |
312 | This means that if a route matches ip access-list number 10 it's | |
313 | local-preference value is set to 200. | |
314 | ||
c1a54c05 | 315 | See :ref:`bgp-configuration-examples` for examples of more sophisticated |
d1e7591e | 316 | usage of route-maps, including of the ``call`` action. |
42fc5d26 | 317 |