Hi all,
I would like to know your opinion about what follows where I would prefer not to use HSRP nor VRRP:
AS x . AS y
.
.
+---+ (1) +---+
+------>| A |-----------| B |
| +---+ . +---+
| | . \
+-------+ | . +---+
| hosts | | . | C |---> default route
+-------+ | . +---+
| . /
+---+ (2) +---+
| E |-----------| D |
+---+ . +---+
.
.
(1) is the main line.
(2) is the backup line.
A,B,C,D,E are routers.
E has a eBGP session with C via (A,B) and get a full routing table
E has a iBGP session with A and send a full routing table.
OSPF is also running between A and E where they both redistributing their connected subnet.
E sends its traffic to C via (A,B) as it prefer this path rather than via D.
A sends its traffic to C via (B) as it prefer this path rather than via E.
Hosts sends its traffic via A
Untill here things are working as described.
Now I would configure A and E with the *same* loopback IP address where none of them would advertise it to anybody.
E and A are having traffic to C via the preferd path (1).
Then A would have a iBGP session with C only as long as the line (1) is up.
When the line (1) is down, C would have an iBGP session with E only via the line (2).
At this point, Host would just be configured to have a default-route instead of
a default-gateway.
Thank you.
Regards,
Christophe
------------------------------------------
Faites un voeu et puis Voila ! www.voila.fr
I would like to know your opinion about what follows where I would prefer not to use HSRP nor VRRP:
AS x . AS y
.
.
+---+ (1) +---+
+------>| A |-----------| B |
| +---+ . +---+
| | . \
+-------+ | . +---+
| hosts | | . | C |---> default route
+-------+ | . +---+
| . /
+---+ (2) +---+
| E |-----------| D |
+---+ . +---+
.
.
(1) is the main line.
(2) is the backup line.
A,B,C,D,E are routers.
E has a eBGP session with C via (A,B) and get a full routing table
E has a iBGP session with A and send a full routing table.
OSPF is also running between A and E where they both redistributing their connected subnet.
E sends its traffic to C via (A,B) as it prefer this path rather than via D.
A sends its traffic to C via (B) as it prefer this path rather than via E.
Hosts sends its traffic via A
Untill here things are working as described.
Now I would configure A and E with the *same* loopback IP address where none of them would advertise it to anybody.
E and A are having traffic to C via the preferd path (1).
Then A would have a iBGP session with C only as long as the line (1) is up.
When the line (1) is down, C would have an iBGP session with E only via the line (2).
At this point, Host would just be configured to have a default-route instead of
a default-gateway.
Thank you.
Regards,
Christophe
------------------------------------------
Faites un voeu et puis Voila ! www.voila.fr