What I did:
Make Sure for internal iBGP we are one-hop away (directly connected) by using Generic TTL security mechanism.
Why I did:
Without this change it's possible on packet chassis i-BGP can be established even if there no direct connection. Below is the example
- Let's say we have 3 LC's LC1/LC2/LC3 each having i-BGP session session with each other over Loopback4096
- Each LC's have static route towards other LC's Loopback4096 to establish i-BGP session
- LC1 learn default route 0.0.0.0/0 from it's e-BGP peers and send it over to LC2 and LC3 over i-BGP
- Now for some reason on LC2 static route towards LC3 is removed/not-present/some-issue we expect i-BGP session should go down between LC2 and LC3
- However i-BGP between LC2 and LC3 does not go down because of feature ip nht-resolve-via-default where LC2 will use default route to reach Loopback4096 of LC3. As it's using default route BGP packets from LC2 towards LC3 will first route to LC1 and then go to LC3 from there.
Above scenario can result in packet mis-forwarding on data plane
How I fixed it:-
To make sure BGP packets between i-BGP peers are not going with extra routing hop enable using GTSM feature
neighbor PEER ttl-security hops NUMBER
This command enforces Generalized TTL Security Mechanism (GTSM), as specified in RFC 5082. With this command, only neighbors that are the specified number of hops away will be allowed to become neighbors. This command is mutually exclusive with ebgp-multihop.
We set hop count as 1 which makes FRR to reject BGP connection if we receive BGP packets if it's TTL < 255. Also setting this attribute make sure i-BGP frames are originated with IP TTL of 255.
How I verify:
Manual Verification of above scenario. See blow BGP packets receive with IP TTL 254 (additional routing hop) we are seeing FIN TCP flags as BGP is rejecting the connection
Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>
What I did:
Enable Sending BGP Community over internal neighbors over iBGP Session
Microsoft ADO: 25268695
Why I did:
Without this change BGP community send by e-BGP Peers are not carry-forward to other e-BGP peers.
str2-xxxx-lc1-2# show bgp ipv6 20c0:a801::/64
BGP routing table entry for 20c0:a801::/64, version 52141
Paths: (1 available, best #1, table default)
Not advertised to any peer
65000 65500
2603:10e2:400::6 from 2603:10e2:400::6 (3.3.3.6)
Origin IGP, localpref 100, valid, internal, best (First path received)
Last update: Tue Sep 26 16:08:26 2023
str2-xxxx-lc1-2# show ip bgp 192.168.35.128/25
BGP routing table entry for 192.168.35.128/25, version 52688
Paths: (1 available, best #1, table default)
Not advertised to any peer
65000 65502
3.3.3.6 from 3.3.3.6 (3.3.3.6)
Origin IGP, localpref 100, valid, internal, best (First path received)
Last update: Tue Sep 26 15:45:51 2023
After the change
str2-xxxx-lc2-2(config)# router bgp 65100
str2-xxxx-lc2-2(config-router)# address-family ipv4
str2-xxxx-lc2-2(config-router-af)# neighbor INTERNAL_PEER_V4 send-community
str2-xxxx-lc2-2(config-router-af)# exit
str2-xxxx-lc2-2(config-router)# address-family ipv6
str2-xxxx-lc2-2(config-router-af)# neighbor INTERNAL_PEER_V6 send-community
str2-xxxx-lc1-2# show bgp ipv6 20c0:a801::/64
BGP routing table entry for 20c0:a801::/64, version 52400
Paths: (1 available, best #1, table default)
Not advertised to any peer
65000 65500
2603:10e2:400::6 from 2603:10e2:400::6 (3.3.3.6)
Origin IGP, localpref 100, valid, internal, best (First path received)
**Community: 1111:1111**
Last update: Tue Sep 26 16:10:19 2023
str2-xxxx-lc1-2# show ip bgp 192.168.35.128/25
BGP routing table entry for 192.168.35.128/25, version 52947
Paths: (1 available, best #1, table default)
Not advertised to any peer
65000 65502
3.3.3.6 from 3.3.3.6 (3.3.3.6)
Origin IGP, localpref 100, valid, internal, best (First path received)
**Community: 1111:1111**
Last update: Tue Sep 26 16:10:09 2023
Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>
Boot up a switch, if frrcfgd is enabled with frr_mgmt_framework_config being "true",
then "bgpmon" process should not be running after this change. bgpmon should be
running when bgpcfgd is enable with frr_mgmt_framework_config being "false"
### Why I did it
##### Work item tracking
- Microsoft ADO **(number only)**:13366345
#### How I did it
Add generic omprog file in all dockers for rsyslog plugin support. Add file to docker-config-engine-bullseye so no need to add individually.
#### How to verify it
UT/Pipeline
### Why I did it
Currently there is only rsyslog plugin support for /var/log/syslog, meaning we do not detect events that occur in frr logs such as BGP Hold Timer Expiry that appears in frr/bgpd.log.
##### Work item tracking
- Microsoft ADO **(number only)**: 13366345
#### How I did it
Add omprog action to frr/bgpd.log and frr/zebra.log. Add appropriate regex for both events.
#### How to verify it
sonic-mgmt test case
Why I did it
Add no-export to bgp sentinel community-list. So that bgp updates from bgp sentinel service must match sentinel community and no-export, otherwise, the bgp update will be dropped.
Work item tracking
Microsoft ADO (24946274):
How I did it
Add no-export to bgp sentinel community-list.
How to verify it
Run UT, case would pass. Build the image and start the device. Add bgp sentinel and check that no-export community exist in bgp sentinel community list.
What I did:
Fix the Loopback0 IPv6 address of LC's in chassis not reachable from peer devices.
Why I did:
For Ipv6 Loopback0 address we only advertise /64 subnet to the peer devices. However, in case of chassis each LC will have it own /128 address of that /64 subnet . Since this /128 address does not get advertised peer devices can-not ping/reach the LC's loopback0.
How I fix:
Advertise /128 Loopback0 Ipv6 address only between i-BGP peers. This way even though /64 is advertised to e-BGP peer devices when packet reaches any of LC's it can reach the appropriate LC's.
How I verify:
Manual verification
UT added for same.
Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>
Why I did it
For route registry service, in order to block hijacked routes, IBGP session needs to be set up from BGP sentinel service to SONiC, and BGP sentinel service advertise the same route with higher local-preference and no export community. So that SONiC takes the route from BGP sentinel as the best path and does not advertise the route to EBGP peers.
In order to do that, new route-maps are needed. So this change adds a new set of templates, keeping BGPSentinel peers out of the other templates.
Work item tracking
Microsoft ADO (number only): 24451346
How I did it
Add sentinel_community in constants.yml, route from BGPSentinel do not match this community will be denied.
Add support to convert BGPSentinel related configuration in the BGPPeerPassive element of the minigraph to a new BGP_SENTINELS table in CONFIG_DB
Add a new set of "sentinels" templates to docker-fpm-frr
Add a new BGP peer manager to bgpcfgd, to add neighbors from the BGP_SENTINELS table using the "sentinels" templates
Add a test case for minigraph.py, making sure the BGPSentinel and BGPSentinelV6 elements create BGP_SENTINELS DB entry.
Add a set of test cases for the new sentinels templates in sonic-bgpcfgd tests.
Add sonic-bgp-sentinel.yang and a set of testcases for the yang file.
How to verify it
Testcases and UT newly added would pass.
Setup IPv4 and IPv6 BGPSentinel services in minigraph, and load minigraph, show CONFIG_DB and "show runningconfig bgp", configuration would be loaded successfully.
Using t1-lag topo and setup IBGP session from BGPSentinel to SONiC loopback address, IBGP session would up.
Advertise route from BGPSentinel to T1 with sentinel_community, higher local-preference and no-export communiyt. In T1, show bgp route, the result is "Not advertise to any EBGP peer".
Withdraw the route in BGPSentinel, in T1, route would advertise to EBGP peers.
Advertise route from T1 that does not match sentinel_community, in T1, would not see the route in show bgp route.
#### Why I did it
To fix the timezone sync issue between the containers and the host. If a certain timezone has been configured on the host (SONIC) then the expectation is to reflect the same across all the containers.
This will fix [Issue:13046](https://github.com/sonic-net/sonic-buildimage/issues/13046).
For instance, a PST timezone has been set on the host and if the user checks the link flap logs (inside the FRR), it shows the UTC timestamp. Ideally, it should be PST.
What I did:
Workaround for the issue seen here : FRRouting/frr#13682
It seems there is timing issue where there are multiple recursive lookup needed to resolve nexthop of the route it's possible that it does not happen correctly causing route to remain in inactive state
Issue is seen on chassis-packet as there 2 level of recursive lookup needed for a given e-BGP learnt route
- Level1 to resolve e-BGP peer (connected route via bgp ) over Loopback4096 (i-BGP peering)
- Level 2 Loopback4096 over backend port-channels next-hops
For VOQ chassis there is no e-BGP peer (connected route via bgp ) resolution as route is added as Static route by orchagent over Ethernet-IB.
Also as part of this remove route-map policy from instance.conf.j2 as same is define in peer-group.j2.
Microsoft ADO: https://msazure.visualstudio.com/One/_workitems/edit/24198507
How I verify:
Functional Verification manually
Updated UT.
We will be adding sanity check in sonic-mgmt to make sure none of route are in inactive state.
Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>
TSA/B/C scripts invoke commands that require root permissions. If the user does not have sudo permissions, the scripts today execute until the command and throw a backtrace with error at the specific command. Added a check to ensure the operations check for root permissions upfront.
* [static_route][staticroutebfd]fix an issue on deleting a non-bfd static route
Fix an issue for deleting a non-bfd static route also remove the staticroutebfd from critical_processes list and make it auto restart in the case of crash.
Why I did it
To support BGPMon sessions from each T2 linecard ASIC
Work item tracking
Microsoft ADO (number only): 17873174
How I did it
Added change in BGPMon configuration to use Loopback4096 as source interface, since this has a unique IP per ASIC.
How to verify it
Tested by manually setting up BGPMon session on T2 LC and verified that Loopback4096 could be used as source
What I did:
In FRR command update source <interface-name> is not at address-family level. Because of this
internal peer route-map for ipv6 were getting applied to ipv4 address family. As a result
TSA over iBGP for Ipv6 was not getting applied.
How I verify:
Manual Verification of TSA over both ipv4 and ipv6 after fix works fine.
Updated UT for this.
Added sonic-mgmt test gap: sonic-net/sonic-mgmt#8170
Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>
Why I did it
Support for SONIC chassis isolation using TSA and un-isolation using TSB from supervisor module
Work item tracking
Microsoft ADO (number only): 17826134
How I did it
When TSA is run on the supervisor, it triggers TSA on each of the linecards using the secure rexec infrastructure introduced in sonic-net/sonic-utilities#2701. User password is requested to allow secure login to linecards through ssh, before execution of TSA/TSB on the linecards
TSA of the chassis withdraws routes from all the external BGP neighbors on each linecard, in order to isolate the entire chassis. No route withdrawal is done from the internal BGP sessions between the linecards to prevent transient drops during internal route deletion. With these changes, complete isolation of a single linecard using TSA will not be possible (a separate CLI/script option will be introduced at a later time to achieve this)
Changes also include no-stats option with TSC for quick retrieval of the current system isolation state
This PR also reverts changes in #11403
How to verify it
These changes have a dependency on sonic-net/sonic-utilities#2701 for testing
Run TSA from supervisor module and ensure transition to Maintenance mode on each linecard
Verify that all routes are withdrawn from eBGP neighbors on all linecards
Run TSB from supervisor module and ensure transition to Normal mode on each linecard
Verify that all routes are re-advertised from eBGP neighbors on all linecards
Run TSC no-stats from supervisor and verify that just the system maintenance state is returned from all linecards
Signed-off-by: Stepan Blyschak stepanb@nvidia.com
DEPENDS: #12852
Why I did it
To support BGP pending FIB suppression.
How I did it
I backported patches from FRR 8.4 feature that allows communicating ASIC route status back to FRR.
Also, added a new field in DEVICE_METADATA YANG model table. Added UT for YANG model changes.
How to verify it
Run on the switch.
Why I did it
dplane_fpm_nl is a new FPM implementation in FRR. The old plugin fpm will not have any new features implemented. Usage of the new plugin gives us ability to use BGP suppression feature and next hop groups in the future.
How I did it
Switch to dplane_fpm_nl zebra plugin from old fpm plugin which is not supported anymore
Remove stale patches for old fpm plugin and add similar patches for dplane_fpm_nl
How to verify it
Build and run on the switch.
Signed-off-by: Stepan Blyschak <stepanb@nvidia.com>
#### Why I did it
Improve naming convention for bgp notification events and change type of leaf for sonic-events-host mem usage from uint64 to decimal64
#### How I did it
Replace "-" with "_"
Replace uint64 with decimal64
#### How to verify it
Run yang model unit tests
#### Description for the changelog
Change YANG model leaf naming convention for bgp notification
- Why I did it
Support syslog rate limit configuration feature
- How I did it
Remove unused rsyslog.conf from containers
Modify docker startup script to generate rsyslog.conf from template files
Add metadata/init data for syslog rate limit configuration
- How to verify it
Manual test
New sonic-mgmt regression cases
Why I did it
To ensure, that after a BGP startup, dualtor T0 receives BGP updates before sending out BGP updates.
Please refer to sonic-net/SONiC#1161 for more details.
How I did it
add coalesce-time 10000 to the frr bgp startup config.
Signed-off-by: Longxiang Lyu <lolv@microsoft.com>
- Why I did it
The values for config_db "docker_routing_config_mode" are:
separated: FRR config generated from ConfigDB, each FRR daemon has its own config file
unified: FRR config generated from ConfigDB, single FRR config file
split: FRR config not generated from ConfigDB, each FRR daemon has its own config file
This commit adds:
split-unified: FRR config not generated from ConfigDB, single FRR config file
- How I did it
In docker_init.sh, when split-unified is used, the FRR configs are not generated
from ConfigDB. What's more, "service integrated-vtysh-config" is configured in vtysh.conf.
- How to verify it
FRR config not overwritten when FRR container starts.
Signed-off-by: Arnaud le Taillanter <a.letaillanter@criteo.com>
bgpd.main.conf.j2: bugfix-9739
* Update bgpd.main.conf.j2 to gracefully handle the bgp configuration cases for when 'bgp_asn' is set to 'None', 'Null', or missing.
How I did it
Include a conditional statement to avoid configuring bgp in FRR when 'bgp_asn' is missing or set to 'None' or 'Null'
How to verify it
Configure 'bgp_asn' as 'None', 'Null' or have it missing from configurations and verify that /etc/frr/bgpd.conf does not have invalid bgp configurations like 'router bgp None'
Description for the changelog
Update bgpd.main.conf.j2 to gracefully handle the bgp configuration cases for when 'bgp_asn' is set to 'None', 'Null', or missing for bugfix 9739.
Signed-off-by: cchoate54@gmail.com
With this PR in, you flap BGP and use events_tool to see the published events.
With telemetry PR #111 in and corresponding submodule update done in buildimage, one could run gnmi_cli to capture BGP flap events.
Why I did it
Migrate FRR to bullseye
How I did it
Makefile and docker config changes to refer to bullseye instead of buster.
How to verify it
Build bullseye frr docker.
Co-authored-by: Rajendra Dendukuri <rajendra.dendukuri@broadcom.com>
* [BGP]Adding configuration knob to allow advertise Loopback ipv6 /128 prefix
By default when IPv6 address is configured with /128 as subnet mask in Loopback0 interface, it will be advertised as prefix with /64 subnet.
To control this behavior a new field 'bgp_adv_lo_prefix_as_128' is introduced in DEVICE_METADATA table which when set to true will advertise prefix with /128 subnet as it is.
Currently, the build dockers are created as a user dockers(docker-base-stretch-<user>, etc) that are
specific to each user. But the sonic dockers (docker-database, docker-swss, etc) are
created with a fixed docker name and common to all the users.
docker-database:latest
docker-swss:latest
When multiple builds are triggered on the same build server that creates parallel building issue because
all the build jobs are trying to create the same docker with latest tag.
This happens only when sonic dockers are built using native host dockerd for sonic docker image creation.
This patch creates all sonic dockers as user sonic dockers and then, while
saving and loading the user sonic dockers, it rename the user sonic
dockers into correct sonic dockers with tag as latest.
docker-database:latest <== SAVE/LOAD ==> docker-database-<user>:tag
The user sonic docker names are derived from 'DOCKER_USERNAME and DOCKER_USERTAG' make env
variable and using Jinja template, it replaces the FROM docker name with correct user sonic docker name for
loading and saving the docker image.
Why I did it
In the recent minigraph changes we add separate BGP session configuration for V4 and V6 internal VoQ neighbors.
This PR is adding different Peer groups for V4 and V6 neighbors
How I did it
Add VOQ_CHASSIS_V4_PEER and VOQ_CHASSIS_V6_PEER groups
Add extra Unit tests
How to verify it
Signed-off-by: Arvindsrinivasan Lakshmi Narasimhan <arlakshm@microsoft.com>
Why I did it
Add TSA/B/C dualtor support
Signed-off-by: Longxiang Lyu lolv@microsoft.com
How I did it
For TSA, toggle all the mux to standby if the device type is dualtor and there are active mux ports.
For TSC, add mux status output.
How to verify it
Run TSA/B/C on a dualtor setup
What I did:
Updated Jinja Template to enable BGP Graceful Restart based on device role. By default it will be enable only if the device role type is TorRouter.
Why I did:-
By default FRR is configured in Graceful Helper mode. Graceful Restart is needed on T0/TorRouter only since the device can go for warm-reboot. For T1/LeafRouter it need to be in Helper mode only
Updated BGP Template for the case:
1. For Packet Chassis do not advertise Loopback4096 address into BGP as there is Static Route for same.
Having this route in BGP causes two level of recursion in Zebra and cause assert in Zebra
when there are many nexthop involved
2. Advertise only P2P Connected IP's into BGP (External Peers). For Packet chassis we have backend IP Interface subnet and if
they get advertised into BGP then it also causes recursion
The BGP_VOQ_CHASSIS_NEIGHBOR keepalive and holdtime timers are
configured similar to general neighbors. Changes are done to configure
BGP_VOQ_CHASSIS_NEIGHBOR timers similar to BGP_INTENAL_NEIGBOR since voq
chassis bgp neighbors are similar to bgp internal neighbors in
multi-asic. As it is done for bgp internal neighbors, the keepalive and
holdtime timers are set to 3 and 10 seconds respectively. Also similar
to bgp internal neighbors, connection retry timer is also configured for
voq chassis bgp neighbors.
Signed-off-by: vedganes <vedavinayagam.ganesan@nokia.com>
Why I did it
resolves#8979 and #9055
How I did it
Remove the file static.conf.j2,which adds the default route on eth0 from bgp docker
Signed-off-by: Arvindsrinivasan Lakshmi Narasimhan <arlakshm@microsoft.com>
What I did:
Fix the typo in Internal Peer Group template for Packet-based Chassis.
Address Review comments of PR: [chassis-packet] minigraph parsing and BGP template changes #8966
- Static Route Parsing for Host
- Formatting of chassis port_config.ini
1. Changes for Generation LC-Graph for packet-based chassis.
2. Added Support Ipv6 Peering on Loopback4096 for voq also
3. Updated asic topology yml files to be offset of slot
4. Made slot_num to take string slot<number> instead of number
5. Consolidated template_dpg_voq_asic.j2 into dpg_asic.j2
6. Remove Loopback4096 from asic topology and parse as dut invertory for
multi-asic
7. Updated topo_facts parsing for asic topology_
8. Internal BGP Session rename from <VoqChassisInternal> to <ChassisInternal> and take switch_type as value.
Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>
For multiasic, the back end asics use ip addresss of Loopback4096 for BGP router id. In VOQ multi-asic chassis there are no back end asics. All the asics are front end and the iBGP connections are established via Ethernet-IB of asics. Since these asics are not designated as BackEnd, the ip address of interface Loopback0 is used as BGP router id. Since the ip address of Loopback0 is same for all the asics in the line card, same router id is used for voq iBGP configurations and hence the iBGP connections are not established. Changes are done to fix this
Why I did it
There are scenarios that End-of-RIB comes from a part of the peers arrives after reconciliation. In such scenarios, if the route selection deferral timer has the default value of 360 seconds, FRR would not set up routes and all routes would be removed after reconciliation. This PR reduces the route selection deferral timer so that at least routes to parts of the peers get restored at the point of reconciliation.
Fix#7488
How I did it
Reduce route selection deferral timer for bgp graceful restart to 15 seconds.
Signed-off-by: Arvindsrinivasan Lakshmi Narasimhan <arlakshm@microsoft.com>
In the multi asic platforms all the ASIC are advertising the same IPv6 /64 network from Loopback4096.
Therefore, the IPv6 loopback address of backend asic is not learnt on the frontend asic.
Change the bgpd.conf.main.conf.j2 template file to advertise the Loopback4096 ipv6 address as /128
Signed-off-by: Yong Zhao yozhao@microsoft.com
Why I did it
Currently we leveraged the Supervisor to monitor the running status of critical processes in each container and it is more reliable and flexible than doing the monitoring by Monit. So we removed the functionality of monitoring the critical processes by Monit.
How I did it
I removed the script process_checker and corresponding Monit configuration entries of critical processes.
How to verify it
I verified this on the device str-7260cx3-acs-1.
