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BGP: Add 'allow bgp_med' option for EBGP sessions
This option allows to treat bgp_med as regular transitive attribute on EBGP sessions (without hacks in filters). Minor changes from committer.
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@ -2625,12 +2625,19 @@ using the following configuration parameters:
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keeps MED attribute). Default: disabled.
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<tag><label id="bgp-allow-local-pref">allow bgp_local_pref <m/switch/</tag>
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A standard BGP implementation do not send the Local Preference attribute
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to eBGP neighbors and ignore this attribute if received from eBGP
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Standard BGP implementations do not send the Local Preference attribute
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to EBGP neighbors and ignore this attribute if received from EBGP
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neighbors, as per <rfc id="4271">. When this option is enabled on an
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eBGP session, this attribute will be sent to and accepted from the peer,
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EBGP session, this attribute will be sent to and accepted from the peer,
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which is useful for example if you have a setup like in <rfc id="7938">.
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The option does not affect iBGP sessions. Default: off.
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The option does not affect IBGP sessions. Default: off.
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<tag><label id="bgp-allow-med">allow bgp_med <m/switch/</tag>
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Standard BGP implementations do not propagate the MULTI_EXIT_DESC
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attribute unless it is configured locally. When this option is enabled
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on an EBGP session, this attribute will be sent to the peer regardless,
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which is useful for example if you have a setup like in <rfc id="7938">.
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The option does not affect IBGP sessions. Default: off.
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<tag><label id="bgp-allow-local-as">allow local as [<m/number/]</tag>
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BGP prevents routing loops by rejecting received routes with the local
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@ -1834,7 +1834,7 @@ bgp_update_attrs(struct bgp_proto *p, struct bgp_channel *c, rte *e, ea_list *at
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/* MULTI_EXIT_DESC attribute - accept only if set in export filter */
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a = bgp_find_attr(attrs0, BA_MULTI_EXIT_DISC);
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if (a && !(a->fresh))
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if (a && !a->fresh && !p->cf->allow_med)
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bgp_unset_attr(&attrs, pool, BA_MULTI_EXIT_DISC);
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}
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@ -108,6 +108,7 @@ struct bgp_config {
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int interpret_communities; /* Hardwired handling of well-known communities */
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int allow_local_as; /* Allow that number of local ASNs in incoming AS_PATHs */
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int allow_local_pref; /* Allow LOCAL_PREF in EBGP sessions */
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int allow_med; /* Allow BGP_MED in EBGP sessions */
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int allow_as_sets; /* Allow AS_SETs in incoming AS_PATHs */
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int enforce_first_as; /* Enable check for neighbor AS as first AS in AS_PATH */
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int gr_mode; /* Graceful restart mode (BGP_GR_*) */
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@ -199,6 +199,7 @@ bgp_proto:
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| bgp_proto ALLOW LOCAL AS ';' { BGP_CFG->allow_local_as = -1; }
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| bgp_proto ALLOW LOCAL AS expr ';' { BGP_CFG->allow_local_as = $5; }
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| bgp_proto ALLOW BGP_LOCAL_PREF bool ';' { BGP_CFG->allow_local_pref = $4; }
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| bgp_proto ALLOW BGP_MED bool ';' { BGP_CFG->allow_med = $4; }
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| bgp_proto ALLOW AS SETS bool ';' { BGP_CFG->allow_as_sets = $5; }
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| bgp_proto GRACEFUL RESTART bool ';' { BGP_CFG->gr_mode = $4; }
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| bgp_proto GRACEFUL RESTART AWARE ';' { BGP_CFG->gr_mode = BGP_GR_AWARE; }
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