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This command will trigger the OSPF forwarding address suppression in
translated type-5 LSAs, causing a NSSA ABR to use 0.0.0.0 as a forwarding
address instead of copying the address from the type-7 LSA
Example: In a topology like: R1 --- R2(ABR) --- R3(ASBR)
R3 is announcing a type-7 LSA that is translated to type-5 by the R2 ABR.
The forwarding address in the type-5 is by default copied from the type-7
r1# sh ip os da external
AS External Link States
LS age: 6
Options: 0x2 : *|-|-|-|-|-|E|-
LS Flags: 0x6
LS Type: AS-external-LSA
Link State ID: 3.3.3.3 (External Network Number)
Advertising Router: 10.0.25.2
LS Seq Number: 80000001
Checksum: 0xcf99
Length: 36
Network Mask: /32
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 10.0.23.3 <--- address copied from type-7 lsa
External Route Tag: 0
r2# sh ip os database
NSSA-external Link States (Area 0.0.0.1 [NSSA])
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.23.3 8 0x80000001 0x431d E2 3.3.3.3/32 [0x0]
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 0 0x80000001 0xcf99 E2 3.3.3.3/32 [0x0]
r2# conf t
r2(config)# router ospf
r2(config-router)# area 1 nssa suppress-fa
r2(config-router)# exit
r2(config)# exit
r2# sh ip os database
NSSA-external Link States (Area 0.0.0.1 [NSSA])
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.23.3 66 0x80000001 0x431d E2 3.3.3.3/32 [0x0]
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 16 0x80000002 0x0983 E2 3.3.3.3/32 [0x0]
r1# sh ip os da external
OSPF Router with ID (11.11.11.11)
AS External Link States
LS age: 34
Options: 0x2 : *|-|-|-|-|-|E|-
LS Flags: 0x6
LS Type: AS-external-LSA
Link State ID: 3.3.3.3 (External Network Number)
Advertising Router: 10.0.25.2
LS Seq Number: 80000002
Checksum: 0x0983
Length: 36
Network Mask: /32
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0 <--- address set to 0
External Route Tag: 0
r2# conf t
r2(config)# router ospf
r2(config-router)# no area 1 nssa suppress-fa
r2(config-router)# exit
r1# sh ip os da external
OSPF Router with ID (11.11.11.11)
AS External Link States
LS age: 1
Options: 0x2 : *|-|-|-|-|-|E|-
LS Flags: 0x6
LS Type: AS-external-LSA
Link State ID: 3.3.3.3 (External Network Number)
Advertising Router: 10.0.25.2
LS Seq Number: 80000003
Checksum: 0xcb9b
Length: 36
Network Mask: /32
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0 <--- address set to 0
External Route Tag: 0
r2# conf t
r2(config)# router ospf
r2(config-router)# no area 1 nssa suppress-fa
r2(config-router)# exit
r1# sh ip os da external
OSPF Router with ID (11.11.11.11)
AS External Link States
LS age: 1
Options: 0x2 : *|-|-|-|-|-|E|-
LS Flags: 0x6
LS Type: AS-external-LSA
Link State ID: 3.3.3.3 (External Network Number)
Advertising Router: 10.0.25.2
LS Seq Number: 80000003
Checksum: 0xcb9b
Length: 36
Network Mask: /32
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 10.0.23.3 <--- address copied from type-7 lsa
External Route Tag: 0
Signed-off-by: ckishimo <carles.kishimoto@gmail.com>
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| babeld | ||
| bfdd | ||
| bgpd | ||
| debian | ||
| doc | ||
| docker | ||
| eigrpd | ||
| fpm | ||
| gdb | ||
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| include | ||
| isisd | ||
| ldpd | ||
| lib | ||
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| ospfclient | ||
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| bootstrap.sh | ||
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| config.version.in | ||
| configure.ac | ||
| COPYING | ||
| COPYING-LGPLv2.1 | ||
| Makefile.am | ||
| README.md | ||
| stamp-h.in | ||
FRRouting
FRR is free software that implements and manages various IPv4 and IPv6 routing protocols. It runs on nearly all distributions of Linux and BSD and supports all modern CPU architectures.
FRR currently supports the following protocols:
- BGP
- OSPFv2
- OSPFv3
- RIPv1
- RIPv2
- RIPng
- IS-IS
- PIM-SM/MSDP
- LDP
- BFD
- Babel
- PBR
- OpenFabric
- VRRP
- EIGRP (alpha)
- NHRP (alpha)
Installation & Use
For source tarballs, see the releases page.
For Debian and its derivatives, use the APT repository at https://deb.frrouting.org/.
Instructions on building and installing from source for supported platforms may be found in the developer docs.
Once installed, please refer to the user guide for instructions on use.
Community
The FRRouting email list server is located here and offers the following public lists:
| Topic | List |
|---|---|
| Development | dev@lists.frrouting.org |
| Users & Operators | frog@lists.frrouting.org |
| Announcements | announce@lists.frrouting.org |
For chat, we currently use Slack. You can join by clicking the "Slack" link under the Participate section of our website.
Contributing
FRR maintains developer's documentation which contains the project workflow and expectations for contributors. Some technical documentation on project internals is also available.
We welcome and appreciate all contributions, no matter how small!
Security
To report security issues, please use our security mailing list:
security [at] lists.frrouting.org